Redline 12W-34 in my Supra

[davefr]

I blended 4 qts Redline 10W-30 with 1 qt of Redline's 20W-50 "molasses" for my twin turbo Supra.

Toyota recommends 10W-30 but I never drive it when freezing weather is imminent so I thought I'd "spike" it with the qt of 20W-50 for the summer.

When you blend different viscosities are you getting the straight mathmatical proportions? (ie 12W-34)

Now that Delvac 1 is available (masquerading as Mobil One Truck and SUV) would it be a better oil for a turbocharged car?

I only drive 1k mi/yr. and change oil and filter annually. I think the Redline is good due to the Moly but I understand the Redline Esther formula is somewhat hygroscopic. Is that bad for annual changes?

 

[unDummy]

SAE j300 is a range for each weight. You're still probably a 30wt oil with the blend. Maybe, you might've bumped it to a 40wt.

Only a UOA will tell you if once a year is good or bad with the brand you choose.

 

[MolaKule]

Like paraffininc oils, hygroscopy of esters has been way overblown.

Like sulfur in gear lubes, there are mediating additives that take care of any so-called effects.

In answer to your question, each oil may have different levels of VII's so the reationship is not linear but logarithmic. For example, one can take a 4cSt oil and add the proper amount of VII to make it 7 cSt. An alternative is to mix varying base oil viscosities to make the target viscosity using a Graff chart or a computer program.

Make your mix and then have a VOA done by Terry Dyson so you know what you really have.

[ April 19, 2004, 04:47 PM: Message edited by: MolaKule ]

 

[buster]

Why not just run RL 5w-40?

 

[MolaKule]

Oh Buster there you go being logical.

 

[harrydog]

I used 4 qts of 10w30 and 1 qt of 20w50 Redline in my turbo Subaru. Based on the UOA's, it liked Redline 10W40 a little better. I normally run 10w30 but from now on, if I want something a little heavier, I'll just use the 10w40.
I also remember some years ago, talking to Roy Howell (Redline's chemist) about what to use in my Audi Turbo. I was concerned that 10w30 might not give me enough high temp protection but I also thought that their 10w40 might not be as shear stable since I assumed it contained more VII than either the 10w30 or the 20w50. He assured me that the 10w40 would be the prefered way to go, even when doing track time in very hot climates.
After 5000 miles on each, the vis @ 100 C was 12.31 for the 1w30/20w50 mix and 14.35 for the 10w40.

[ April 19, 2004, 08:17 PM: Message edited by: harrydog ]

 

[davefr]

The local parts store has a very limited selection of Redline. (10W-30 and 20W-50)

quote:

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Originally posted by buster:
Why not just run RL 5w-40?

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[harrydog]

I buy mine mail order. Myoilshop.com has good prices and good service. I can't even find it locally.