A75 What oil for summer?

[1938BF50]

It's time for an oil change. I have been using Aeroshell 15-50. How many of you are using the 100W for summer use?

[3Dreaming]

Re: A75 What oil for summer?

Mike, I think the 100W will be a good choice. Tom

[cvavon]

Re: A75 What oil for summer?

I ran 100w winter and summer in my A65 . In the new C85 i broke it in on 20/50 Phillips about 40 hrs on it carries 40 psi oil pressure hot.Is on second oil change about 1/2 qt usage in 28 hr. Does have spin on filter.

[jim cooper]

Re: A75 What oil for summer?

In 55 years of flying I've heard many different opinions of oil brands and weight. Some old timers recommended straight 50 wt. in summer, some 40, others said 20-50 Phillips, some aero shell, on and on. I have always understood that upon starting the engine , the most wear occurs in the first few seconds as the oil finally reaches the furthest points. So I use 20-50 all year long. In maryland it gets quite hot in summer and quite cold in winter I use shell as that's what the airport sells. I try to buy from the airport I fly from as many of them are slowly going broke. I think most small airports buy the oil they get the best deal on. I am a STRONG believer in spin on filters as I think they extend the life of the engine a good bit. I hope others chime in. ( My 65 HP, 650 hrs. Burned a quart in about 12 hours which I thought quite good. Changed oil EVERY 20-25 hours without fail, cheapest insurance you can buy.). I always check the screen everytime too! Best, JC

[M Towsley]

Re: A75 What oil for summer?

The dreaded oil question. I found this website that explains straight and multi-viscosity in easy, simple to understand terms. It is not about aviation oil, but oil in-general. The link I provided goes to the 'Oil University' information, but there is other great information here.

Basically you are asking if you want to use fifty weight, or fifty weight. They are both the same at operating temperature. One works better at startup, the other doesn't.

http://www.bobistheoilguy.com/motor-oil-101/

[jim cooper]

Re: A75 What oil for summer?

YES! Excellent article!