Bumping up oil weight with higher mileage: myth? [Archive] - GrandAmGT.com Forum

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[ChaosweaveR]
04-12-2011, 07:59 AM
As the topic states, increasing oil weight as an engine increases with age and mileage, myth or true?

Now, I've been using 5W-30 oil ever since I bought the car in July '07. The last two oil changes, I've noticed the engine eating a quart of oil in between my 5000 mile intervals. I've been using Castrol Synthetic Blend, 5W-30 with AC Delco oil filters (PF-52, oversized)

Suggestions?

burgett2103
04-12-2011, 11:28 AM
shouldn't you be using the ph-3387A? my truck uses the pf-52 filter. i think i always roll with 10W-30 and i've never had a problem with burning oil. just over 100K on the odometer

[ChaosweaveR]
04-12-2011, 12:32 PM
shouldn't you be using the ph-3387A? my truck uses the pf-52 filter. i think i always roll with 10W-30 and i've never had a problem with burning oil. just over 100K on the odometer

Fock that small filter. The PF-52 for the 4.3L V6 works on most smaller GM V6s needing the PF47 filter. I get an extra .3 quarts in the pan.

rocketfast123
04-12-2011, 01:40 PM
would not hurt to try. The oil is just gonna be a tad bit thicker on start-up

Malaclypse
04-12-2011, 07:22 PM
No need. Just keep running 5w30.

Besides... I wouldn't really consider any engine below 200k to be high mileage anymore.

bricooper78
04-12-2011, 07:30 PM
it used to help, but the internal tolerances are so tight now, and the inner channels the oil flows through are so much smaller that it won't help you at all, and may actually make things worse, pressure too high, pump failures etc

i've heard that 5 times from 5 different places, i'd be scared to try it

[ChaosweaveR]
04-23-2011, 05:48 PM
Nobody else? Rather surprised...

plastic_indian
04-24-2011, 08:42 AM
I've employed oils with higher pour points to quiet knocks and rattles in tired engines (and engines that have been, ahem, "economically repaired" in the backyard...) with moderate success, but it is my experience that engines that use oil keep using it just the same. If an engine has legitimately accumulated wear to the point of dropping oil pressure, it sure isn't going to hurt to go a bit heavier (and it definitely isn't going to cause oil pump failure - look at the masses using 20% Lucas additive as evidence - if that mucus doesn't break anything, switching from a 5- to a 10- pour point sure won't hurt).

If it's just a quart/oil change interval, have you verified PCV system is up to snuff?

[ChaosweaveR]
04-24-2011, 10:33 AM
The car was seafoamed at 103K, and the PCV valve is two years old. I've never had an issue with EGR codes coming about, but I've noticed the idle is a tad rough.