Need advice for turbo engine

[Arjun]

Guys, I've been using M1 T&SUV 5w40 on my turbo charge Honda (aftermarket turbo) and have been very happy with it. With the recent re-labeling/out of stock issues, I'm wondering whether to just switch to regular M1 5w30 and be done with fancy oils. My current OCI is 3000 miles (the turbo is oil cooled so going more than that is not an option). The turbo generates a lot of heat so I need an oil that won't shear easily. I'm based in Northern Virginia now, so I do see me share of cold starts in the morning.

Any advice is appreciated.

 

[bretfraz]

I'm sure most of the popular synthies would work for you, including the M1 5-30 as well as GC 0W-30 or even Pennzoil Platinum 5-30. Have you done any analysis to see how well the 5-40 was working?

 

[Arjun]

No, I haven't done a UOA yet. I figured that with a 40wt I'd be safe from shear. Add to that this is a 5w40, and I was covered for cold starts.

Does any one have UOA of 5w30 vs 5w40?

 

[Titan]

The more spread you have in an oil, such as a 5-40 compared to a 5-30, the more likely it would be to shear, wouldn't it? Assuming you are comparing the same brand mineral oil, of course. I'd suggest Castrol 0-30 Syntec. German Green, if you can find it. It is on the thick side of 30 weight, almost a 40 weight, and it is reported to be surprisingly shear-resistant. Otherwise, I'd go with some other synthetic X-30 weight, as synthetics tend to be more shear-resistant.

 

[wavinwayne]

I'd go with a 5w40. Four good 5w40's come to mind, rated in order of availability:

Shell Rotella T
Castrol Syntec
Valvoline Synpower
Havoline Synthetic

Any of these 4 will serve you & your turbo well, especially with 3k mile OCI's.

 

[BrianWC]

Why not use the T&SUV 5W30?

 

[sprintman]

Use a real synthetic eg. Group IV or V basestock. Then you can't go wrong IMO.