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RIP non synthetic motor oil

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#11 DavidGraves


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Posted 12 October 2021 - 01:16 PM

Howdy Michelle


Does that mean I can switch from 5 W 20 in my 2005 5.4 Dodge Ram to a synthetic ?


What weight would you suggest ?.....light load driving in 30-100 degree Farenheit.





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#12 Mighty Dodge Ram

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Posted 12 October 2021 - 03:03 PM

I’m not a petroleum engineer, just my anecdotal experience. I used to be brand loyal rather than “type” loyal, I ran Pennzoil conventional in my Dodge 5.9 gasser right up to 302k miles when it was sold. Chevy calls for either conventional or synthetic in my current (2002) 6.0 gasser, 5w-30. The engine has an iron block and aluminum heads and has a reputation for “piston slap”, especially when cold. I switched to full synthetic and experienced increased slap and a feeling of additional vibration when accelerating…again, anecdotal. I now use semi-syn, same weight, for high mileage engines and am happy with it. I do carry additional oil with me but haven’t had a problem finding it while on the road. Just a thought, YMMV. 

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1996 Dodge Ram 1500 4x4, lightly lifted, ARB bumper/Warn winch, BFG AT/KO2, Snugtop shell. SOLD! But not forgotten!
2002 Chevy 2500HD XC LB 6.0L 4X4, Leer Hi-Rise shell, completely stock...for now!

#13 michelle_east_county


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Posted 13 October 2021 - 07:02 AM

DavidGraves, ' dunno. Check manufacturer technical service bulletins or good mechanics.
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