Aeroshell Oil in Continental Engines

170C · Post by **170C** » Fri Jul 28, 2006 1:29 pm

I need a refresher on what the fellow at the engine overhaul facility at Kelowna airport told us regarding his recommendation of not using Aeroshell 15/50 in Continental engines. I don't remember why he didn't recommend doing so and another member has asked me if I remembered----naturally I didn't

I also thought he said Phillips 20/40 or 20/50

was OK. Can any of you that attended the convention and went on that tour refresh my memory on this subject?

ron74887 · Post by **ron74887** » Fri Jul 28, 2006 2:08 pm

Frank, they recommended not using areoshell 100+ or 15w-50 due the the additive put in for lycoming engines. w100 and 20w-50 was ok as long as it didn't have the additive. ron

Post by **Bruce Fenstermacher** » Fri Jul 28, 2006 4:03 pm

Ron is right. They didn't like the Lycoming additive for Continental engines. This is not the first time I've heard this so I was not surprised.

Jr.CubBuilder · Post by **Jr.CubBuilder** » Fri Jul 28, 2006 9:07 pm

What is the Lyc. additive supposed to do?

johneeb · Post by **johneeb** » Fri Jul 28, 2006 9:31 pm

Jr.CubBuilder wrote:What is the Lyc. additive supposed to do?

Make your engine run like a 4 cylinder.

Jr.CubBuilder · Post by **Jr.CubBuilder** » Fri Jul 28, 2006 10:01 pm

Excelent

lowNslow · Post by **lowNslow** » Fri Jul 28, 2006 10:44 pm

N9149A wrote:Ron is right. They didn't like the Lycoming additive for Continental engines. This is not the first time I've heard this so I was not surprised.

Bruce, I missed why they didn't like the additive. How was it bad for the engine?

Fri Jul 28, 2006 11:18 pm

I can't remember exactly.

But here is a stab at what I think I remember.

I think because the cam on a Lycoming is on top of the case the additive helps the oil to adhere to it and lubricate it. The additive is not necessary in a Continental because the cam shaft is at the bottom of the case and oil will flow over it. The additive just promotes oil coking in the Continental.

Please don't hold me to this I could be all wet here.

lowNslow · Post by **lowNslow** » Fri Jul 28, 2006 11:31 pm

Thanks Bruce.

ron74887 · Post by **ron74887** » Sat Jul 29, 2006 3:12 pm

That's part of it but the other problem is it(THE ADDITIVE) does not like the magnesium of our oil pans and accessory case at all causing severe corrosion. Had pans with holes corroded thru at the front drian plug and right in front of the intake cross over. real problem at overhaul time. Ron

Post by **Bruce Fenstermacher** » Sat Jul 29, 2006 3:50 pm

Hadn't heard about the additive/magnesium issue. Thought most of the corrosion in the pains was caused by water laying there.

Curtis Brown · Post by **Curtis Brown** » Sat Jul 29, 2006 5:05 pm

Would there be any ill effects to change from Aeroshell W100 after 375hrs or so to Phillips 20/50?

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mit · Post by **mit** » Sat Jul 29, 2006 5:40 pm

Horse hockey! There isn't anyting wrong with Aero Shell w oil. In the 80's it was the rage.....

Post by **Bruce Fenstermacher** » Sat Jul 29, 2006 7:20 pm

Tim it may have been the rage in the 80s but in the 80s how many Continentals had been run on it for 20 years? It's now 2006 and there is a lot more experience with the additive.

The engine builder we visited in Kelowna recommended against using the additive it in Continentals. At the very least it was an unnecessary expense. He does recommend it in Lycoming engines.

If I where using an oil with the additive in my Continental I wouldn't be afraid to stop using the additive regardless of how many hours on the engine.

I also don't care whose brand I buy but I buy the best price aviation oil available. They are all good. I use straight 50 weight (100w) in the summer and usually switch to 20w50 for the winter. The 100w is usually Aeroshell and the 20w50 is usually Phillips because that is what's readily available.