1992 350 crate Smoke after switching to synthetic

50

Asked by Jan 02, 2015 at 01:40 PM about the 1992 Chevrolet C/K 1500 Silverado Standard Cab SB

Question type: Maintenance & Repair

I just did an oil change on my 1992 like I
usually do but this time I was told to use
some royal purple synthetic oil as it is a
good oil and my friend uses it.  I changed
the oil and the pressure and everything is
fine.  It is smoking more and more I run it
but only on one side,  I have dual exhaust
and only the driver side is smoking.  I don't
have a clue why this would be. I usually use  
carol 10-w30 non synthetic but I thought I'd
give synthetic a chance because I hear it
longer to break down.  Could anyone help
me? I'd be glad to give any further details.

25 Answers

101,415

Do a dry and wet compression check on all cylinders. If wet compression check is much higher than dry you probably have ring issues. But if both checks have about the same psi then it's probably just time to put valve guides seals in.

1 out of 1 people think this is helpful.
142,975

The synthetic..especially if you used 5W20 or 5W30...sounds like its slipping past piston rings on that side.

1 out of 1 people think this is helpful.
142,975

hi dandy..Doug if you are not familiar with the difference between a wet and dry compression test here is a really good essay http://www.freeasestudyguides.com/compression-test-injecting-oil.html

1 out of 1 people think this is helpful.
50

I used 10w-30 synthetic just like I did with conventional. From what I understand you can't go back to conventional. Sorry im not the best mechanic I only know so much. Since it's smoking from the driver side exhaust wouldn't that mean that it's coming from the left cylinders? That's where the exhaust is hooked into the manifold on the side it's smoking.

1 out of 1 people think this is helpful.
101,415

Good evening fordnut

142,975

You CAN go back to conventional

1 out of 1 people think this is helpful.
142,975

And yes to your question...that's correct, probably only one of the cylinders though on left bank. Left is looking at engine from rear, drivers side, standing in front of truck looking at engine it's on your right but it's left bank

1 out of 1 people think this is helpful.
50

So you can go back to conventional? Only reason I believed that was I had heard from other people. What reasons would there be why you couldn't? So do you think I should change it back to conventional?

101,415

I am a firm believer in never changing oil types or brands. Every time I have changed I ended up with issues. Only tried different twice and Once blew a motor(slung rod right thru oil pan) and once spun a rod bearing. Both times was within five days of the oil change. Now did it cause my issues. Probably not but its kinda hard to make this old red neck believe that it didn't. I won't try different ever again. Don't care how much better they say it is. If I was in your shoes I would change oil back over to what you was using before.

1 out of 1 people think this is helpful.
50

Okay that's probably what I'll do then. It ran damn good with just catrol in it but I wanted to go longer for oil changed because I drive 80 miles a day to work getting 9 miles a gallon so any expenses gone would help but I'll just change

1 out of 1 people think this is helpful.
142,975

Agreed. There are no reasons you couldn't switch back. Yes, change it back and change again early..like 1000 miles or less

1 out of 1 people think this is helpful.
50

Thanks guys I'll change it today and see if does it any better. BTW 350 crate motor has less than 15000 on it. Brand new when I put it in shouldn't have any ring problems but it hasn't been babied so it could very well. Thanks guys

1 out of 1 people think this is helpful.
101,415

From my experience syn s tend to find the smallest flaws in seals, rings and gaskets on older vehicles. Where as conv oil will not. Changing the oil back will not fix the root problem causing the smoking but it might not be noticeable with conv oil.

1 out of 1 people think this is helpful.
142,975

I use Mobil1 in my Corolla but that's all it's ever had....and USE A QUALITY FILTER! They are not all the same. Wix, Purlator, there are other good ones. this is one case where more expensive is worth every dime

1 out of 1 people think this is helpful.
50

I've always ran Castrol 10w-30 with a wix filter

1 out of 1 people think this is helpful.
101,415

Well that not old at all. For giggles might want to pull your spark plugs out on that side to see which one or ones is burning the oil.

1 out of 1 people think this is helpful.
142,975

And 10W40 in my 1976 F250w/ 390..

1 out of 1 people think this is helpful.
142,975

Wix is one of the best..good choice

1 out of 1 people think this is helpful.
50

Just slung a rod motors locked up.

101,415

No you kidding right? The crate motor when been talking about?

50

Yep. She's locked up.

1 out of 1 people think this is helpful.
101,415

Damn. I hate that. Have you called your friend yet to tell him how much you appreciate him talking you into changing oil types?

1 out of 1 people think this is helpful.
142,975

Oooohhh nooooo say it ain't so...

1 out of 1 people think this is helpful.
50

I appreciate it soon much this shit sucks

142,975

Whoever flagged that..sorry I seldom use that language and shouldn't have here. My apologies..you know what I mean

1 out of 1 people think this is helpful.

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