Adjam5 Posted April 27, 2011 Report Share Posted April 27, 2011 About how many miles should a vehicle have on it before you go up a weight in motor oil? I would imagine that the rings, cam, lifters and main bearing wear after time and a little heavier oil might be better for a engine with at least 100k on it. Most new or newer vehicles(4&6 cyl) suggest 5w-30. Would it help a engine at all to go up a weight in oil? I figure a heavier oil that would provide greater shear protection could only help for a high mileage motor. OR just stay with the OEM suggestion? Quote Link to comment Share on other sites More sharing options...
Shaun_300 Posted April 27, 2011 Report Share Posted April 27, 2011 I'd stick with the same weight of oil, bumping the weight up risks too high of oil pressure causing seals to blow out. Stick with OEM specifications. Engines are built pretty good nowadays, shouldn't have to worry much about wear. Only time I'd run a heavy weight is if I had an old beater with a badly worn engine that had a bearing knock or lower oil pressure just to keep it running as long as possible if I didn't want to replace/rebuild the engine. Quote Link to comment Share on other sites More sharing options...
Adjam5 Posted April 27, 2011 Author Report Share Posted April 27, 2011 Thank you very much Shaun . My 06 corolla is about to break 100K and my K1500 has 176k on it now, so I was just wondering if I could help the motors stay healthier for a while longer. Thanks again. Quote Link to comment Share on other sites More sharing options...
redkneck Posted April 27, 2011 Report Share Posted April 27, 2011 I'm bumpin 260K on the silverado and still runs good. Still running 5w-30 in it, but will likely start adding Lucas oil treatment in the near future. That lifter tap is taking longer and longer to go away on startup, but has always been an issue on the 5.3's seems to me. Quote Link to comment Share on other sites More sharing options...
Shaun_300 Posted April 27, 2011 Report Share Posted April 27, 2011 I'm bumpin 260K on the silverado and still runs good. Still running 5w-30 in it, but will likely start adding Lucas oil treatment in the near future. That lifter tap is taking longer and longer to go away on startup, but has always been an issue on the 5.3's seems to me. That's probably piston slap John. Common for the 5.3L engines. Not much you can do about it, and I wouldn't worry about it. Quote Link to comment Share on other sites More sharing options...
PA_Spike_King Posted April 28, 2011 Report Share Posted April 28, 2011 Shaun, my 4.8 has the piston slap also. I also was told not to worry so I will just keep rolling down the highway. Quote Link to comment Share on other sites More sharing options...
Shaun_300 Posted April 28, 2011 Report Share Posted April 28, 2011 Yep, don't worry about it. It's caused by the short piston skirts in the LS style engines, they rock in the cylinder when they're cold, shortly after start up they've expanded to normal size and no longer slap. Quote Link to comment Share on other sites More sharing options...
mike13candace Posted April 28, 2011 Report Share Posted April 28, 2011 You want lubrication early when the engine is cold. Stick to the recomended weight. Quote Link to comment Share on other sites More sharing options...
redkneck Posted April 28, 2011 Report Share Posted April 28, 2011 Read up on piston slap, pretty interesting. Sounds like they didn't have their crap together at manufacturing. Quote Link to comment Share on other sites More sharing options...
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