Recent content by userfriendly

Michelin rolled out new and improved CC3s in May. That should give people more to complain about.

I wonder if it goes bad? I have a package of 8 100ml bottles (red) still in the shrink wrap from 2003. 3.2 litres makes 32:1. 5 litres makes 50:1. Easy math with the metric system. Name that movie….. Do you know what they call a quarter pounder with cheese in France? Tell him Vincent.

I would, because putting 0w20 in a GM V8 is not a manufacturing defect.

PC under reports their HTHS numbers. Magically one year the 15w40s and 10w40s dropped from 4.4 and 4.3 to 4.1. According to the tear-off booklets stuck to the jugs and pails the CK-4 offerings share the same additive chemistry and treat rates. Phosphorus shows the CK-4 limit of 1,200. It...

Going from a worn out tire to a new one will cause a loss of fuel economy. Next is tread design. A 5 rib HT tire will get better fuel economy than an AT traction tire. Next (imo) is the tire cross section, tire pressure and tire to wheel width ratio. Next is the side wall construction and...

Yep. The A3B4 xW40s typically come in around 3.7-3.8 HTHS which is my target for just about anything with stock bearing clearances. That includes my deleted LML, my son’s 6.2 F350 and my daughter’s 22 3.6L Acadia. I arrive at 3.7 in my LML by mixing 15w40 and 10w30 Duron together, Duron 5w40 is...

I thought he meant 2.2 thousands rods and 2.75 thousands mains. Anyway, I don’t see the point of running xW30 on a 4.25” crank. There’s nothing to gain over 15w40 as a starting point and a lot to lose. Thin around and find out. Maybe learn from what happened when GM put 0w20 in their 6.2L.

It’s definitely not a 10W30 engine. I’d say a minimum HTHS of 3.8, which is the low end for a xW40.

I suppose it depends on which 10w30. Mobil 1300 CK4/SP for example, has a HTHS of 3.6 while Walmart 10w30 is around 3.2. I like 2.5 thou rods ‘n mains on BBCs because the un-skirted block is not as rigid as modern V8s which allows some flex that can eat into bearing clearances. Next is...

What are your crank and rod bearing clearances? The 10w30 recommended by your engine rebuilder sounds a little thin. HDEO 15w40 has always worked for me in BBCs and SBCs.

Could be counterfeit. Do you have any illegal migrants in Colorado?

It looks thin from the photos. It could be mis-labeled 10W30.

The Geek bases his wear rates on three dyno pulls on a 70 year old engine design.

The intent of engine oils like Dexos R 5W50 is to ensure high oil pressure to bearings and rotating parts furthest from the oil pump without causing excessive heat and power loss from redundant HTHS.

I read somewhere that “Under stress a lubricant is reduced to its base oil viscosity.” That would be different from temporary shear of polymer additives in the bearing clearances from rotational forces. I believe the statement indicated that temporary shear can also be caused by high load...