Recommend a thick 10w-30

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My engine calls for 10w-30, and that’s all I use. It is a turbocharged performance car from the 90s, with no emissions. Mainly an auto cross toy, but I do drive it to events. So I have never looked at actual racing oils.

I’ve just used Mobil 1 synthetic 10w-30. It shears out of the 30 weight range pretty quickly, and my valvetrain will also get noisy within 1,500 miles. It does see hard use, and I should probably be looking into a better oil more suited for a car that is seeing mainly abuse.

Any recommendations for something that holds a 30 weight better, or is on the thicker side of the 30 weight range?
 

OVERKILL

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Are you sure it is shear and not just fuel dilution? That's pretty common with forced induction engines as the tunes tend to be a bit rich. I'd probably step up to an xW-40 or go with a heavier 5w-30/10w-30 like something from Redline.
 

Abax25

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Are you sure it is shear and not just fuel dilution? That's pretty common with forced induction engines as the tunes tend to be a bit rich. I'd probably step up to an xW-40 or go with a heavier 5w-30/10w-30 like something from Redline.

You’re correct. Slight dilution, but nothing scary. Redline I would need to order, and prefer something I can just find at a local store.

The people I race with, have recommend diesel oils. Not sure I feel comfortable with that.
 
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I would say Total quartz 9000 energy 0w30. 3.5mpas hths viscosity. Or any other xw30 meeting ACEA A3/B4. 0W is preferred for the higher synthetic component if you haven't a clue about other specs like Noack or flash point which are also an indication of base oil viscosity.
 

OVERKILL

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You’re correct. Slight dilution, but nothing scary. Redline I would need to order, and prefer something I can just find at a local store.

The people I race with, have recommend diesel oils. Not sure I feel comfortable with that.
What lab did you use? Just asking because if it was Blackstone, it's probably way off.

Those people are making a pretty safe recommendation, HDEO's are quite popular in high performance applications and have proven to perform quite well.
 
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I don’t know why you want to stick with a 10/30, just go to one of the Euro A3/B4 oils in a 0/40 or 5/40 and be done with it. I used Castrol 0W40 in my track Civic Si that called for 5W30 and it loved it.
 
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