Best oil?
03-31-2013, 10:50 PM
#21
By this, you can determine an oil can protect better than another.
03-31-2013, 11:05 PM
#23
There is nothing wrong with Rotella, but the 5W-40 would be a better option for a stock motor. LSs like a thin 40 weight or a thick 30 weight. In my H/C 347 I run Mobil 15W-50
04-01-2013, 08:29 AM
#24
I disagree ignoring the owners manual or the cap on the oil neck. That's like ignoring the engine builder who built your engine. He knows what he set it up to run. Why would you ignore that?
04-01-2013, 08:33 AM
#25
Staging Lane
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The engine is designed/engineered to run on a certain viscosity. Especially the bearing clearances; too thick of oil and you may have lubrication issues.
I disagree ignoring the owners manual or the cap on the oil neck. That's like ignoring the engine builder who built your engine. He knows what he set it up to run. Why would you ignore that?
I disagree ignoring the owners manual or the cap on the oil neck. That's like ignoring the engine builder who built your engine. He knows what he set it up to run. Why would you ignore that?
04-01-2013, 09:19 AM
#26
The thing is a 0w-30 can easily be thicker than a 5w-30 or 10w-30, most folks fail to understand that the "30" is a range and believe the "Xw" number affects the hot viscosity.
Without going and grabbing the manual for my truck I can say that many vehicles that spec 5w-30 on the oil cap allow for 10w-30 above 0F but most folks will blindly chant 5w-30 anyway.
on top of that oils can either shear down and get thinner with use or oxidize and thicken, and formulas change. For awhile M1 10w-30 was VERY thin as 30weight oils go and with some use was actually more like a 20weight, at the other end of things you run a Amsoil 0w-30 and it can easily become a 40weight because as it ages it tends to oxidize and thicken rather than shear down at the molecular level and get thinner.
Point being there is a LOT of ignorance and marketing based loyalty in oils. Bobistheoilguy is going to be the best bet for data based opinions.
The site has been down for some time but there was someone with an f-body that ran extended intervals with M1 and Amsoil and had analysis done ever 1000miles, pretty interesting read. Hopefully the article pops back up rehosed somewhere else.
Without going and grabbing the manual for my truck I can say that many vehicles that spec 5w-30 on the oil cap allow for 10w-30 above 0F but most folks will blindly chant 5w-30 anyway.
on top of that oils can either shear down and get thinner with use or oxidize and thicken, and formulas change. For awhile M1 10w-30 was VERY thin as 30weight oils go and with some use was actually more like a 20weight, at the other end of things you run a Amsoil 0w-30 and it can easily become a 40weight because as it ages it tends to oxidize and thicken rather than shear down at the molecular level and get thinner.
Point being there is a LOT of ignorance and marketing based loyalty in oils. Bobistheoilguy is going to be the best bet for data based opinions.
The site has been down for some time but there was someone with an f-body that ran extended intervals with M1 and Amsoil and had analysis done ever 1000miles, pretty interesting read. Hopefully the article pops back up rehosed somewhere else.
Last edited by 96capricemgr; 04-01-2013 at 09:25 AM.
