Quote:
Originally Posted by ECO-AKJ
The engine from the factory was made to run on 5W30 from the factory, but I do understand the thinking of running higher weight due to mileage but this engine has very tight bearing clearances, unlike the old pushrod engines of the 60s-80s, just my two cents, keep up the good work!
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Quote:
Originally Posted by Piotrsko
Being an old timer: you ran thicker oil to prevent oil bypassing places where it should stay. Usually you found external evidence that it was leaking like a trail of smoke when accelerating, trail of smoke decelerating , smoke cloud idling. Oil fouling the plugs. Note the trend. With 50 weight you primed the crankcase with fuel to thin the oil enough to start an aircraft engine any time it was colder than 45f otherwise it wasn't going to crank.
Todays stuff has tighter clearances used than olden days had as new
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The truth is, I haven't gone up in range much at all, as far as precise viscosity's concerned. I've even gone
lower in viscosity range (when hot) compared to the 5w30 that I could have used.
The numbers on the bottles just refer to viscosity ranges, they're not entirely accurate numbers. I haven't even gone outside the 5w30 range (read on for that.)
Data Sheet Viscosity Specs for Amsoil Signature Series 5w30 and 10w30:
5w30:
Kinematic Viscosity @ 40ºC (104ºF,) cSt (ASTM D445) --- 59.7
Kinematic Viscosity @ 100ºC (212ºF,) cSt (ASTM D445) --- 10.3
10w30:
Kinematic Viscosity @ 40ºC (104ºF,) cSt (ASTM D445) --- 62.3
Kinematic Viscosity @ 100ºC (212ºF,) cSt (ASTM D445) --- 10.0
Compare them to Pennzoil Synthetic Blend 5w30:
Viscosity
@ 40°C (104ºF,) cSt ASTM D-445 --- 60.4
@ 100°C (212ºF,) cSt ASTM D-445 --- 10.5
Also, compare to Pennzoil Gold Synthetic Blend 5w30 (the thickest I've compared to, thicker than my 10w30, yet it's still a 5w30: )
Kinematic Viscosity @ 40C (104ºF,) cSt ASTM D445 --- 63.2
Kinematic Viscosity @ 100C (212ºF,) cSt ASTM D445 --- 11.0
(Links to these Data Sheets are at the bottom.)
So, my 10w30 is thinner than one (and probably more) 5w30s in the given temperature ranges. Yes, it's thicker when colder than the Ams. Sig. Series 5w30, but I'm using a block heater anyway.
Yeah, once you get to the 50ºF range and below, the viscosity could be a good bit higher than it may otherwise be with an Amsoil Sig. Series 5w30 or 0w30. I'm not worried, between my block heater and the idea of attaching an oil pan heater.
Also, on a non-fuel economy subject, the engine
does run a tiny bit quieter than if I was using Pennzoil Platinum 5w30. I used that for a while, and comparatively, this Amsoil Oil makes the lifters quieter downhill in 3rd gear than I ever heard them before. Before using Amsoil Sig. Series oil, they weren't worryingly loud, but I did notice a bit of lifter tick. Now, I don't hear it near as much.
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Data Sheet Sources:
Both Amsoil Oils:
https://amsoilcontent.com/ams/lit/da...tins/g2880.pdf
Pennzoil Oils, respectively:
https://s7d9.scene7.com/is/content/G...24561pdf?$PDF$
https://s04.static-shell.com/content...-Motor-Oil.pdf
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