Yes I seem to remember something along those lines. Gotta be something like a 0w8 for qualifying and then like you mentioned something thicker for the actual race.I recall it discussed on a thread a while back, I wonder if @MolaKule might know?
Yes I seem to remember something along those lines. Gotta be something like a 0w8 for qualifying and then like you mentioned something thicker for the actual race.I recall it discussed on a thread a while back, I wonder if @MolaKule might know?
Yes I seem to remember something along those lines. Gotta be something like a 0w8 for qualifying and then like you mentioned something thicker for the actual race.
Nascar Pro stocks are street stock type cars. Wet sump with an oil cooler if wanted. They run oil temps ALOT hotter than 113*F.My limited information is that NASCAR Sprint Cup engines use an oil with an 8.5 to 9.5 cSt@100C kinematic viscosity
while NASCAR Pro Stock uses an oil with a 4.5 cSt@100C viscosity.
Nascar Pro Stock engine oil cooling systems keep the oil temps to down around 45C while NASCAR Sprint Cup engines run at about 105C.
Im sure many different sanctioning bodies use that name for a class.I thought Pro Stock was for drag racing. Correct me please if I'm wrong.
I'd be curious to know what those grades are for Nascar.
Funny, the 5w30 I use is a RC pcmo A5/B5= 3.3 hths.
Adds power? Perhaps the better explanation is less parasitic drag, hence a wee bit more power to the wheels?Ask the Pro Stock guys why they run 0W-3 if it adds no meaningful power. I would say it's been pretty well proven it's faster than the 20W-50 they ran years ago.
Adds power? Perhaps the better explanation is less parasitic drag, hence a wee bit more power to the wheels?
Wuuut?The United States is a far harsher climate than Europe so it is kind of silly to compare their choice of oil. Temperatures here range from 115F to -45F. It is a huge country. Many parts are extremely arid and dusty, while others are wet. Cherry picking an owners manual to claim that some other country's oil recommendation is right and your own country's is wrong, is unconvincing.
You are mixing "yours" API /ILSAC 5w30 with "our" ACEA 5w30..... Dont you?5W-30 IS CAFE!! In the 1980's, there were blurbs in many (mainly GM) manuals that said "5W-30 is not recommended for sustained highway operation" yet today it's a "thick" oil. And whether your bearing clearances statement is true or not, many engines starting in the 1990's relied more on OHC and DOHC for efficiency and to balance the incremental increases in horsepower with the demands for greater fuel economy, and I am pretty sure OEM's wanted oils that "flowed faster to the top of the motor", or so we were told in quickie lube training, irregardless of whatever the standard statement of "there is a coating of oil left in the upper parts of a motor anyways" or not...
I agree more or less. But slightly thicker oils in Europe also comes into play in regards to extended OCIs, no one wants a 20W when the 30W may well sheer down after 10K and the 20W may get close to a 15W in an extended interval, all hypothetical of course...
Wuuut?
EU stretches from Nordkapp to ""European"" part of Turkey or Malta down on deep south...
And it has roads like Autobahn in Germany to dusty roads on deep south or everywhere in between...
Go back to elementary school and participate at geography this time!
Gene, the oil I am referring to has the API starburst so it's not a specialty oil. I believe Valvoline, QSUD and Mobil all produce mainstream engine oils with higher hths that still fall into the RC category. Amsoil OE 5w30 is 3.3 hths API starburst labeled and Resource Conserving, A5/B5. Cheers.A PCMO 5W-30 that is not either a GF-5/GF-6 type (2.9 minimum and usually 3.05-3.20 ) or an A3 type (3.5 minimum) is extremely rare in the USA.
Some exceptions exist but they are not mainstream products here and usually only available from a vehicle manufacturer or specialist.
Not many vehicles that specify an oil in that middle ground in our market.
Gene, the oil I am referring to has the API starburst so it's not a specialty oil. I believe Valvoline, QSUD and Mobil all produce mainstream engine oils with higher hths that still fall into the RC category. Amsoil OE 5w30 is 3.3 hths API starburst labeled and Resource Conserving, A5/B5. Cheers.
I'd have to look it up Gene. I'll try to get that to you though.The oils I'm familiar with are rarely above 3.2 HTHS. The only one that came to mind was Castrol Professional. Perhaps I need to broaden my horizons. What would be the M1 that is 3.3 HTHS? EP 5W-30 HM perhaps?