post #1 of Old 05-15-2002, 07:36 AM Thread Starter
92cherokee
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Post Using 20w50

I have a '92 with a 4.0 HO. I hear a knock in the motor and read that I may have a rod knock. People suggest putting in 20w50 to see if the knock disappears. My question is if it helps, can I keep this weight oil in the motor? Or is it too thick? Thanks...

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post #2 of Old 05-15-2002, 08:21 AM
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well, that is a good question because today i just asked a person about that and they said dont put it in but I dont know I would like some feed back on this too.

thx

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post #3 of Old 05-15-2002, 10:23 AM
4wheeler4CJ
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OK, I get to toot my horn once again

I use 20W-50 in EVERY vehicle once it reaches 100,000 miles, until then I use 10W-40. I live in the Northeast, and I don't "adjust" for temperature. I never get any "cold-start" ticking ever, even in the winter. ALL of my vehicles and engines go WELL over 200,000 with no problems or maintenance, short of changing oil, etc. And, doing mostly highway miles, I wait till 7500 miles. 3000 miles is BS unless you drive like grandma, it is simply un-necessary and costly. Most manuals will even tell you 7500. And I don't believe in synthetics. Why would I ever pay 4 times as much for that when I always go well over 200,000 miles using regular oil?

OK, that said, yes, if you have a noise and want to quiet it, try 20W-50. You may need to address the problem mechanically, but it will help to use thicker oil for now. Hell, you can even use straight 30W oil. And, yes, you can leave it in year-round. As I said, I live where we have weather changes, LOL, and never adjust for temperature.

So, that's my story and I'm sticking to it.

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post #4 of Old 05-15-2002, 10:39 AM
tom from boston
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4wheeler4CJ,
i'm just over 140K in my 4.0L auto 94 sport. it's my daily driver / winter car / beater. i noticed today that i was down about a QT. i'm assuming i'm getting some blowbye from worn rings so no big deal. would 20w50 help with this as the "tolerances" haver definitely been loosened over the last 8+ years of service?
thanks,
tom

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post #5 of Old 05-15-2002, 11:01 AM
arpy
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I use 20w50 Valvoline in all my high mileage vehicles all year with no problems. The thicker oil does help a little with the worn tolerances and seals.
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post #6 of Old 05-15-2002, 03:35 PM
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Ok well I bought the Valvoline 20w50 the racing oil is that any different and will I lose power do to it being thicker?

Thanks in Advance

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post #7 of Old 05-15-2002, 09:57 PM
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The race oil is high dollar and made for higher revs than a stock engine can put out, I'd just get the regular Valvoline 20w50 (unless maybe you spend a LOT of time at redline?). I don't think you will sacrifice any performance over say 10w40 or 10w30, its not THAT much heavier. I noticed no difference at all in power when I switched.
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post #8 of Old 05-16-2002, 05:01 AM
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Well since its made for higher rev enigens should I not put it in. I am just looking for the constent weight which this does. It remains at 20w the whole time! doesn't thin or break down which is what I dont want. So will it work ok for this one run until I can get the normal 20w50?

Thanks in Advance

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post #9 of Old 05-16-2002, 03:59 PM
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Sure, it'll work fine, I think it just has some additives in it to protect against thermal breakdown at high revs, and it might be a little better quality than the regular Valvoline. Since you already have it, go for it! I was just saying I wouldn't pay the extra for the race oil because you don't really need it for a stock engine.
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post #10 of Old 05-16-2002, 08:28 PM
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True, i dont need it for the stock engine. I think it was the kid in me that wanted it. LOL I put it in today seems fine.

Thx for the info

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post #11 of Old 05-21-2002, 11:54 AM
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tom from boston,

Yes, 20W50 will certainly help you. As I said I use it regardless of engine condition once it reaches 100,000, and my engines always last "forever".

I personally use Castrol brand, but any quality name other than Quaker State is good. Quaker State causes sludge buildup, according to many engine rebuilders I have talked to, has something to do with crap additives in it or something.
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post #12 of Old 05-21-2002, 06:18 PM
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how about before 100000? point being, wouldnt it run better, even though it sacrefices power? the jeep has 200,000 miles on it (almost exactly, lol) but the engine was new 15,000-20,000 miles ago. (actually, the guy said new, but while replacing the head gaskets, we found evidence to the contrary).

Dan, San Bernardino, California

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post #13 of Old 05-22-2002, 09:35 AM
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To be honest with you, I put in the 20w50 racing oil and I didn't lose any power if anything it seems that i gain power? Even if I didn't gain power I know for a fact I didn't lose any.


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post #14 of Old 05-22-2002, 11:30 AM Thread Starter
92cherokee
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Hi everyone, I put in Valvoline 20w50 with a quart of Rislone, but I still have a knocking sound. Does it take a while for this to work? Thanks...
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