Mixing oil weight-15w /20w

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Question:

Any research I do is dwarfed by the thousands, if not millions of hours the oil companies have done to create oils optimized for aircraft engines. It is simply a fantasy to think otherwise. – Hide quoted text — Show quoted text – I will suggest where you can do your own research… Go to BEL RAY and request the test papers showing wear measurements made on BEL RAY AERO 1 versus other av oils… Bel ray is heavily into racing motorcycle lubricants.. (air cooled engines) If MOBIL’s attorny’s have not burned all the technical papers on their legally ill fated synthetic, there is a treasure trove of information… CASTROL is currently heavy into the synthetic lubricants market (automotive) and will have white papers… While not specifically aircraft engines, the basics apply… RED LINE is heavy into the racing oils market, including air cooled motorcycle engines, and they will have white papers to share… I can give you a number of cogent reasons why my suggestion is the best you can do for now, but a bit of research will expand your horizons… Cheers … Denny

– Hide quoted text — Show quoted text – Could you provide supporting documentation. If you want the best scuffing control on startup, better cling, etc. mix 3 qt. of your favorite aviation oil with one qt. of Mobil One Synthetic… Vary the weight of the Mobil One through the year based upon the temperature, just like using a straight weight oil… Denny

Response:

I’m probably wasting bits here, but I’ll try one more time… First, your reply exhibits lots of emotion and zero facts… Anyone who actually studied the Mobil 1, "engine failures" and understands the chain of events that occurred would not make the statement you did… Second, adding a synthetic base to a petroleum base creates a semisynthetic, like the 15W50 you think so highly of… Which is exactly what I recommended that you do, except I suggested a particular synthetic and an increased percentage in the synthetic/petroleum ratio… Denny – Hide quoted text — Show quoted text – Any research I do is dwarfed by the thousands, if not millions of hours the oil companies have done to create oils optimized for aircraft engines. It is simply a fantasy to think otherwise. I will suggest where you can do your own research… Go to BEL RAY and request the test papers showing wear measurements made on BEL RAY AERO 1 versus other av oils… Bel ray is heavily into racing motorcycle lubricants.. (air cooled engines) If MOBIL’s attorny’s have not burned all the technical papers on their legally ill fated synthetic, there is a treasure trove of information… CASTROL is currently heavy into the synthetic lubricants market (automotive) and will have white papers… While not specifically aircraft engines, the basics apply… RED LINE is heavy into the racing oils market, including air cooled motorcycle engines, and they will have white papers to share… I can give you a number of cogent reasons why my suggestion is the best you can do for now, but a bit of research will expand your horizons… Cheers … Denny Could you provide supporting documentation. If you want the best scuffing control on startup, better cling, etc. mix 3 qt. of your favorite aviation oil with one qt. of Mobil One Synthetic… Vary the weight of the Mobil One through the year based upon the temperature, just like using a straight weight oil… Denny

Response:

I will suggest where you can do your own research… Go to BEL RAY and request the test papers showing wear measurements made on BEL RAY AERO 1 versus other av oils… Bel ray is heavily into racing motorcycle lubricants.. (air cooled engines) If MOBIL’s attorny’s have not burned all the technical papers on their legally ill fated synthetic, there is a treasure trove of information… CASTROL is currently heavy into the synthetic lubricants market (automotive) and will have white papers… While not specifically aircraft engines, the basics apply… RED LINE is heavy into the racing oils market, including air cooled motorcycle engines, and they will have white papers to share… I can give you a number of cogent reasons why my suggestion is the best you can do for now, but a bit of research will expand your horizons… Cheers … Denny – Hide quoted text — Show quoted text – Could you provide supporting documentation. If you want the best scuffing control on startup, better cling, etc. mix 3 qt. of your favorite aviation oil with one qt. of Mobil One Synthetic… Vary the weight of the Mobil One through the year based upon the temperature, just like using a straight weight oil… Denny

Response:

Why would I want to read about a lubricant that destroyed engines? I’ll stick with semi-synthetic AeroShell 15W-50 thank you very much. Not that they handled their recall expeditiously. CASTROL is currently heavy into the synthetic lubricants market (automotive) and will have white papers… While not specifically aircraft engines, the basics apply… RED LINE is heavy into the racing oils market, including air cooled motorcycle engines, and they will have white papers to share… I can give you a number of cogent reasons why my suggestion is the best you can do for now, but a bit of research will expand your horizons… Cheers … Denny

Response:

I was under the impression that one of the problems with synthetic oil was that it didn’t have good clinging properties.

– Hide quoted text — Show quoted text – Just had an oil change (TCM TSIO-520) by a newly introduced mechanic. He used Phillips 15W50 oil which is what I use in the winter, except I generally choose Aeroshell. When I tried to get extra quarts from local FBO, I was told Phillips no longer produce 15W50, it has changed to 20w50 instead. The mechanic used his last batch of the oil and he claimed it’s fine to mix 20w50 with 15w50 since the winter is almost over and we hardly get the extreme cold days (Long Island). Any comments??? snip I seem to remember one of the requirements for recip aviation oil is that it can be mixed with any other "brand" without ill affects. I would think you could come up with some strange viscosities though. As indicated by others, never seen 15W50 Philips oil, X/C has been 20W50 as long as I can remember. TC

Response:

Oh yeah. And I guess all the research to come up with an ideal avaition oil formula that the oil company’s have done isn’t as good as this homebrew?

Response:

Could you provide supporting documentation.

Response:

Just had an oil change (TCM TSIO-520) by a newly introduced mechanic. He used Phillips 15W50 oil which is what I use in the winter, except I generally choose Aeroshell. When I tried to get extra quarts from local FBO, I was told Phillips no longer produce 15W50, it has changed to 20w50 instead. The mechanic used his last batch of the oil and he claimed it’s fine to mix 20w50 with 15w50 since the winter is almost over and we hardly get the extreme cold days (Long Island). Any comments??? Thanks Jackson Peng

Response:

Just had an oil change (TCM TSIO-520) by a newly introduced mechanic. He used Phillips 15W50 oil which is what I use in the winter, except I generally choose Aeroshell.

I don’t think Phillips makes a 15W50 (at least not in rencent memory). If you have Phillips oil, it was 20W50. However, to answer the question. Yes, it’s fine to mix the grades within reason (15W50 and 20W50 really shouldn’t make much of a difference).

Response:

snip I seem to remember one of the requirements for recip aviation oil is that it can be mixed with any other "brand" without ill affects. I would think you could come up with some strange viscosities though. As indicated by others, never seen 15W50 Philips oil, X/C has been 20W50 as long as I can remember. TC

Response:

If you want the best scuffing control on startup, better cling, etc. mix 3 qt. of your favorite aviation oil with one qt. of Mobil One Synthetic… Vary the weight of the Mobil One through the year based upon the temperature, just like using a straight weight oil… Denny – Hide quoted text — Show quoted text – Just had an oil change (TCM TSIO-520) by a newly introduced mechanic. He used Phillips 15W50 oil which is what I use in the winter, except I generally choose Aeroshell. When I tried to get extra quarts from local FBO, I was told Phillips no longer produce 15W50, it has changed to 20w50 instead. The mechanic used his last batch of the oil and he claimed it’s fine to mix 20w50 with 15w50 since the winter is almost over and we hardly get the extreme cold days (Long Island). Any comments??? snip I seem to remember one of the requirements for recip aviation oil is that it can be mixed with any other "brand" without ill affects. I would think you could come up with some strange viscosities though. As indicated by others, never seen 15W50 Philips oil, X/C has been 20W50 as long as I can remember. TC

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