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This is only my opinion, and I'm not an engineer, but I'm thinking the lessor weights have something to do with mileage and ultimate performance. I can neither confirm or deny this but there has been rumors for over 5 years of cars running zero oil pressure engines, this is not that uncommon and is done elsewhere, and on some short tracks, I'm not sure that I'm game to try it, (unless superbeater loses oil pressure at some point, which is a very real possibility) but smaller cars have been doing this for quite awhile, the engine in the Suzuki Samurai for example, uses staged orifices in the main caps so that a minimum amount of oil is sent through the crank bearings. I think in most people's minds that a slightly higher weight oil is used for "insurance" , I'm not sure that is legit.. a higher weight oil would tend to give an artificially higher oil pressure, not necessarily better lubrication.. but that is the way I see it.Any specific reason people opt for the thicker stuff over what the manual recommends (eg- modded engine)? I don't know jack but I'd think Ford wouldn't have skimped on recommending a higher weight oil for track work. It's not like they're paying for it. Would an unnecessarily high weight oil actually be harmful bc engine has to push thru a marginally thicker fluid every cycle multiplied by xxxx rpms for magnitude?
Yeah I should of added, 2020 Bullitt but same manual. Says 5w20 street / 5w30 track synth blend.Ford has recommended 5w50 for track use in a number of model year coyotes so that’s what I run. Full synthetic.
And TIL about the Suzuki Samurai's orifices! I actually almost bid on one of these a few months ago. Such a silly vehicle.This is only my opinion, and I'm not an engineer, but I'm thinking the lessor weights have something to do with mileage and ultimate performance. I can neither confirm or deny this but there has been rumors for over 5 years of cars running zero oil pressure engines, this is not that uncommon and is done elsewhere, and on some short tracks, I'm not sure that I'm game to try it, (unless superbeater loses oil pressure at some point, which is a very real possibility) but smaller cars have been doing this for quite awhile, the engine in the Suzuki Samurai for example, uses staged orifices in the main caps so that a minimum amount of oil is sent through the crank bearings. I think in most people's minds that a slightly higher weight oil is used for "insurance" , I'm not sure that is legit.. a higher weight oil would tend to give an artificially higher oil pressure, not necessarily better lubrication.. but that is the way I see it.