http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=4;t=000419
Motorbike posted this and I'm wondering if the reason certain racing oils such as Mobil 1 R and 76 NASCAR oil are on the "thin" side and only have a HT/HS of 3.0-3.2, is that because the film strength will be higher with a light weight oil at the ring area, versus a thicker viscosity oil? Very few if any run 20w-50 in NASCAR engines anymore. Most qualify with a 0w-5 (Q is one of them) and run the entire race with a 0w-30 or less (Joe Gibbs racing oil is a 5w-20 made by Lubrizol). And with AEHaas, he notice DECREASED oil consumption with a 20wt oil vs Shell 5w-40. On top of that HP is gained. The 5w-20 UOA's have remarkably good. Thoughts?
Direct link to source: Shell Study
[ February 22, 2005, 02:31 PM: Message edited by: buster ]
Motorbike posted this and I'm wondering if the reason certain racing oils such as Mobil 1 R and 76 NASCAR oil are on the "thin" side and only have a HT/HS of 3.0-3.2, is that because the film strength will be higher with a light weight oil at the ring area, versus a thicker viscosity oil? Very few if any run 20w-50 in NASCAR engines anymore. Most qualify with a 0w-5 (Q is one of them) and run the entire race with a 0w-30 or less (Joe Gibbs racing oil is a 5w-20 made by Lubrizol). And with AEHaas, he notice DECREASED oil consumption with a 20wt oil vs Shell 5w-40. On top of that HP is gained. The 5w-20 UOA's have remarkably good. Thoughts?
Direct link to source: Shell Study
[ February 22, 2005, 02:31 PM: Message edited by: buster ]