Tim Jodice Posted May 8, 2020 Report Posted May 8, 2020 6 minutes ago, toto said: You went from the Aeroshell multi-weight to the Victory multi-weight? Yes Quote
toto Posted May 8, 2020 Author Report Posted May 8, 2020 4 hours ago, airtim said: Yes Interesting, thanks. I switched from Aeroshell "Plus" straight weight to Aeroshell 15w50 and I have had worse oil consumption. I was strongly considering going back to the straight weight, but the Victory multi might be a better step. Quote
Tim Jodice Posted May 8, 2020 Report Posted May 8, 2020 1 hour ago, toto said: Interesting, thanks. I switched from Aeroshell "Plus" straight weight to Aeroshell 15w50 and I have had worse oil consumption. I was strongly considering going back to the straight weight, but the Victory multi might be a better step. In 8 years of airplane ownership i have never used straight weight because I was told you need different weights for different seasons or just use multi weight. What are the benefits of straight weight? Quote
toto Posted May 8, 2020 Author Report Posted May 8, 2020 (edited) 10 minutes ago, airtim said: In 8 years of airplane ownership i have never used straight weight because I was told you need different weights for different seasons or just use multi weight. What are the benefits of straight weight? Yeah, Aeroshell makes a 100 for summer and an 80 for winter. There is some logic (Mike Busch? Others?) that says straight weight is better at corrosion protection because it's far more viscous when cold and therefore stays on internal engine parts longer before sliding down into the pan. ETA quote from Mike Busch: "Single-grade oil is especially good at protecting engines against internal corrosion, because it is very thick at ordinary room temperature and sticks to engine parts without stripping off as readily as multi-grade oils." https://www.avweb.com/ownership/which-oil-should-i-use/ Edited May 9, 2020 by toto Found quote Quote
carusoam Posted May 8, 2020 Report Posted May 8, 2020 So... I talked to a guy that OHs starter clutches at KOSH.... Making friendly talk to learn something about the small device that every now and then causes hardship for IO550 owners... Putting additives in the oil can have interesting side effects... like clutch slippage..... But... by the time that happens... your clutch is was due anyways.... On the topic of straight weight vs. multi... If you have the skill to select your oil based on temperature... and the oil change schedule... that matches the seasons, and where you are going to... go straight weight... The wrong straight weight in winter has the tendency to clog the oil cooler.... The wrong straight weight in the summer has a tendency to be too watery and not lubricate as well... PP thoughts only, not a mechanic... Best regards, -a- 1 Quote
jaylw314 Posted May 9, 2020 Report Posted May 9, 2020 7 hours ago, toto said: Yeah, Aeroshell makes a 100 for summer and an 80 for winter. There is some logic (Mike Busch? Others?) that says straight weight is better at corrosion protection because it's far more viscous when cold and therefore stays on internal engine parts longer before sliding down into the pan. ETA quote from Mike Busch: "Single-grade oil is especially good at protecting engines against internal corrosion, because it is very thick at ordinary room temperature and sticks to engine parts without stripping off as readily as multi-grade oils." https://www.avweb.com/ownership/which-oil-should-i-use/ Poking through Mike Busch's materials, I don't think he's ever provided any data or evidence that that statement is true. in his webinars, he sometimes makes it clear that's just an intuitive conclusion he's come to, rather than a conclusion based on anything solid. As to the Lycoming additive, I think it's an organic phosphate ester, which have been used in aviation motors for decades, with the idea that phosphates actually "react" (an oversimplification) with iron oxide on the surface of steel to form a slippery and tough film. AFAIK, CamGuard includes the Lycoming additive, but a bunch of other stuff we know nothing about. So I'd say the Lycoming additive is likely to be safe in Continental motors. I suspect the only reason it's not universally recommended is that the original additive TCP is pretty damn toxic. Reference below. TIL the use of the word "lubricious" https://www.intechopen.com/books/advances-in-tribology/the-tribology-and-chemistry-of-phosphorus-containing-lubricant-additives Quote
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