Originally Posted By: mechtech2
Originally Posted By: ARCOgraphite
Sump size and cooler! If the oil temp is under 190F the oil will be as thick as a 30 grade at 210F in your vintage 302. Ford accounted for the 20 with the big sump and cooler. My Mustang Bullitt ran like garbage on 5w30 after my first oil change dumping the 5w20. The Lincoln dealer Derry, NH didnt have any 5w20 at the time - and neither did the local autoparts store. The engin ewas dead silent on the 20. If its noisey on the 20 then you got a bad engine. Now, Asin motors spec'ing 20grade on cars "really" spec for 40 in europe are an issue - even with you sloth like, generally Terrible American driver. Yeah, you
So you say a 20 is like a 30, but your car "Ran like garbage" on the 30?
Ok...
You are surprised that oil thickness changes with temp? Its all about the sump temp. If the sump doesnt get above 190 then a 30 will have a viscosity similar to a 40 running in a sump above boil temps. Or simply - cold sumps = thick oil. My 2v modular ran like it had molassas in the sump on 30. IDK about bearing area but it must have increased bearing area (or ring pack oil management for thin oils) to drag like that. I recall guys complaing that their 350 mouse ran like a dog after they dumped the type-F tranny oil we broke the engines in with back in the 70s. They did rev quick on the tranny oil vs a 10w40 when tight and new. No failures either in that 2 weeks of tranny oil.
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AFA synthetic being superior - if it spec shows low HTHS it doesnt matter if you run "pathetic" synthetic or so called "Conventional". The HTHS spec will be the high temp (250) sheared viscosity - and, yeah - under 3! Unless you install the right Euro-spec A3/B4 lube or boutique oil - its all "conventional" you are buying in PP or M1. Look at the HTHS! And, Come on now - time to Man Up: conventional lubricants are non-existent - the higher group oils which are now employed in all ILSAC lubes are all, lets call them "pseudo-synthetised". Its just a matter of small degree "improvement" between advertised synthetics and ILSAC GF-5 resource conserving. By spec the ILSAC lubes must SURPASS group iv. If you want to run something superior in the coyote - look for a non ilsac 20 grade with high HTHS above 3. And get ready for 100 dollar oil changes
Originally Posted By: ARCOgraphite
Sump size and cooler! If the oil temp is under 190F the oil will be as thick as a 30 grade at 210F in your vintage 302. Ford accounted for the 20 with the big sump and cooler. My Mustang Bullitt ran like garbage on 5w30 after my first oil change dumping the 5w20. The Lincoln dealer Derry, NH didnt have any 5w20 at the time - and neither did the local autoparts store. The engin ewas dead silent on the 20. If its noisey on the 20 then you got a bad engine. Now, Asin motors spec'ing 20grade on cars "really" spec for 40 in europe are an issue - even with you sloth like, generally Terrible American driver. Yeah, you
So you say a 20 is like a 30, but your car "Ran like garbage" on the 30?
Ok...
You are surprised that oil thickness changes with temp? Its all about the sump temp. If the sump doesnt get above 190 then a 30 will have a viscosity similar to a 40 running in a sump above boil temps. Or simply - cold sumps = thick oil. My 2v modular ran like it had molassas in the sump on 30. IDK about bearing area but it must have increased bearing area (or ring pack oil management for thin oils) to drag like that. I recall guys complaing that their 350 mouse ran like a dog after they dumped the type-F tranny oil we broke the engines in with back in the 70s. They did rev quick on the tranny oil vs a 10w40 when tight and new. No failures either in that 2 weeks of tranny oil.
-
AFA synthetic being superior - if it spec shows low HTHS it doesnt matter if you run "pathetic" synthetic or so called "Conventional". The HTHS spec will be the high temp (250) sheared viscosity - and, yeah - under 3! Unless you install the right Euro-spec A3/B4 lube or boutique oil - its all "conventional" you are buying in PP or M1. Look at the HTHS! And, Come on now - time to Man Up: conventional lubricants are non-existent - the higher group oils which are now employed in all ILSAC lubes are all, lets call them "pseudo-synthetised". Its just a matter of small degree "improvement" between advertised synthetics and ILSAC GF-5 resource conserving. By spec the ILSAC lubes must SURPASS group iv. If you want to run something superior in the coyote - look for a non ilsac 20 grade with high HTHS above 3. And get ready for 100 dollar oil changes
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