Amsoil VS Walmart Mobil One
04-27-2022 | 09:38 PM
#21
Charter Member # 55
Joined: Oct 2000
Posts: 20,272
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From: Omaha/LOTO
I've always like Valvoline VR1 20/50 because of the added Zinc content but I'm not a scientist or expert on the fundamentals of molecules in oil and how much none of that makes a difference with how often we all change the oil in our boats. Sometimes it comes down to availability and what you can always rely on being able to get. Being in the automotive industry everything is getting harder to get (oils, filters etc.) so always buy extra!
04-27-2022 | 10:52 PM
#22
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Joined: Nov 2004
Posts: 14,154
Likes: 3,714
From: On A Dirt Floor
vr1 has 1400 zinc 1300 phosphorous
https://sharena21.springcm.com/Publi...0-ac162d889bd3
mobil 1 15w-50 1300 zinc 1200 phosphorous
http://www.billswebspace.com/mobil_1_product_guide.pdf
04-28-2022 | 06:55 AM
#24
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Posts: 14,154
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From: On A Dirt Floor
04-28-2022 | 08:33 AM
#25
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Joined: Jun 2009
Posts: 9,989
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From: Chicago
The only caveat to the second viscosity number is that it`s measured at 100*C (212*) .
For example a 15-50 weight oil has 50W oil viscosity at 212* , my engines run oil temp at 170-180* at cruise so Am I never seeing 50w , is it somewhere between 15-50? That`s above my paygrade..
A straight weight oil is not going to have that problem.
For example a 15-50 weight oil has 50W oil viscosity at 212* , my engines run oil temp at 170-180* at cruise so Am I never seeing 50w , is it somewhere between 15-50? That`s above my paygrade..
A straight weight oil is not going to have that problem.
04-28-2022 | 09:36 AM
#28
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Joined: Nov 2006
Posts: 1,313
Likes: 153
From: Tygart Lake, WV
Good info here from K1.
My STOCK 496HO main bearing clearance were .002" 1thru4. .0025" #5. Typical tight GM production line specs. Hence why Merc 40w is recommended spec.
main bearings after 600ish hours on $12 15w40.
