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Stay with 5w30 full synthetic oil or find a high mileage full syn or high mileage syn/conv blend ? 180,000 kms = 110k miles.

Not leaking or burning much if any. No parking drip spots. No smoke ever in exhaust. Only used biweekly short city streets grocery pickups. About 20 miles/mth 30kms, 240 miles/yr 360kms. Oil stays goldish for about a yr. Time to change now @ 2yrs 700kms as gotten dark brown. Since 6 yrs ago when got to about 3/4 temp gauge range, valve tappets been tapping. I'm wondering if high mileage oil will help extend life, reduce chance of leaks with it's additives ? Also, I've heard a bit of carbon buildup in ring grooves, valve stem slides, gaskets, helps them keep more seal then if removed possibly by high mileage oil additives meant to clean stuff out ? Gets -30c here in winter so don't want anything to thicken oil. Wondering if tappet noise reduceable with anything and safe, like high mileage oil, additive, etc ? Might leaving slightly dirty full syn oil for while coat and help reduce tapping valve stem noise ? Or is that wee bit of carbon gonna cause more wear harm then good ? 1994 Pontiac Sunbird 2.0 lt 4 cyl. Curious thing is that since oil started getting dirty and darker, though feeling still very slippery with no grit felt, (maybe just a carbon ash ?) mths ago, the tapping tappet sound is now very noticeably quieter, maybe 1/2 the volume. Question is why quieter ? Old getting dirty, maybe bit thicker oil now ?

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  • Steve Pack
    Steve Pack Mar 12, 2018

    I used Mobile 1 extended, on your driving every 2 years on oil change. Extended is rated for 1 year using avg mileage. If you take your cat to Walmart and have oil changed, the Mobile-1 is the same as shelf price, unlike oil change shops..I used a Fram oil filer made for synthetic oil. Price for materials was around $40.00 less if yopu use Gm oil filter.

  • Cam Gibb
    Cam Gibb Mar 20, 2018

    Thx Steve :-)

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  • Cars & Trucks Master
  • 2,561 Answers

Stay with full synthetic preferable Mobile 1 extended.

Posted on Mar 08, 2018

Testimonial: "I saw comments saying synthetic oil molecules are smaller then standard. So I'm wondering if since 1994 manual just says 5w30 oil, likely meaning standard oil, I should use slightly thicker synthetic oil to match that viscosity of standard oil ? Say, 10w30 or 10w40 syn oil ? The tappets are 1/2 less noisy now with 3 yr old 5w30 syn oil (few 1000 kms only short biweekly use) as it's likely gotten but thicker over time which is likely reducing the tapping sound ? If they're quiter cause oil has gotten thicker, then it seems they happier if when I get oil changed that I use thicker 10-30 or 10-40 syn oil ?"

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  • Steve Pack
    Steve Pack Mar 11, 2018

    No Api standards require Oil weights require meetin standards. 10w30 oil is the sme reqardless of oil brand Thiscker oil is not required, tolorances on engines are tight so heavier oil is not required. I don't know whre you live but in the winter the lightest oil required will cut down on wear. on cold starts. The ability of oil to cling to surfaces after engine shutdown is importns. Before I retired from natural gas cryogenics processing planst the engine compressor packages would buy a very nice home and the onlu oil used was Mobile. I run Mobile 1 extended in my pickup an enjoy the 4 MPG increase. my brother runs Mobi-l in his pickup He drives many miles per day. It is your car and the choice is yours. However all new care come with a blend or pure sythenic oil from factory.

  • Cam Gibb
    Cam Gibb Mar 12, 2018

    Thx.

  • Cam Gibb
    Cam Gibb Mar 12, 2018

    Thx Steve Pack.

  • Steve Pack
    Steve Pack Mar 12, 2018

    Use 5w30 Mobil- 1 or you can use a synthetic blend. Mobil Super 5W-30, Engine Oil

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Posted on Jan 02, 2017

MrScary66613
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SOURCE: my 2000 gmc sierra is leaking oil on my driveway more than normal

It's not good to Switch back to Regular oil after using Synthetic. Use the High Mileage oil. It will help a Little. Still Cheaper to replace a Gasket or two than a Rebuild. Got 214,000 + Miles on my 95' Silverado and No Leaks with High Mileage Valvoline 10-40.

Posted on Jan 03, 2009

  • 383 Answers

SOURCE: High mileage oil change for a 1994 Nissan Pickup; what to use?

mkimdaly: There is a product on the market called "Restore" which is an oil additive designed specifically for high mileage engines with oil consumption and smoking problems. Mind you, it will not fix evey situation, but it has resolved quite a few on cars which have come through my shop. "Mechanic in a can".
If I am not mistaken, it is designed to fill in small scratches that may be in the cylinder walls. I also has an effect on lifters and on oil seals. There is also a product put out by "Lubromoly" it is a product made in Germany and you may not find it on the shelves at normal retailers, but possibly carried at repair shops which specialize in imports. I carry this product line at my shop and have had good luck with many of their other products as well. There is a company called "Worldpac" but they only sell to repair shops. The product line I am talking about, I have to buy must be bought by the case.
I am sure there may be other comparable products on the market which you may find at "OReilley's or Autozone. You need to speak to their sales people and possibly ask to talk to one of the people who are at their wholesale desk at the back who may be even more familiar with the products. FOLLOW THE INSTRUCTIONS CAREFULLY! The main reason many products don't seem to work well, is that they are not applied as the manufacturer had instructed in the can and/or box! A product as old as the hills and twice as dusty is "Marvel Mystery oil" I have used it on engines which had little or no compression and pulled the plugs, poured the oil in the cylinders and let it sit over night. I would spin the engine over in the morning to blow the oil out, screw the plugs back in and fire the engine back up. There have been many times than I have had engine regain compression because the oil freed up rings that had stuck to the pistons. This oil can be added to the motor oil and the GAS! As far as the type of oil to use in the engine: It really depends on how well you have taken care of your engine to begin with. If you have done frequent oil and filter changes and the engine is relatively clean inside, I would run a 20W-40 with the additive and in my shop, I happen to use Castrol. Although most premium oils will perform quite well. If you have an engine with a lot of sludge buildup inside it, the sludge is probably the only thing holding it together. WARNING!!!!! DO NOT USE ANY KIND OF ENGINE FLUSH DESIGNED TO CLEAN THE INTERNALS OF THE ENGINE! When I refer to this, I mean a product that instructs you to put it in, run the engine for a while, drain it and then replace the oil and filter. YOU WILL IN ALL LIKELY HOOD DO MORE HARM TO THE ENGINE THAN HELP!
I hope I have answered your question.
Good luck.

Posted on Jul 17, 2009

  • 3 Answers

SOURCE: Tappets making a constant noise

i would suggest asking your mechanic which viscosity(thickness) oil he put back in and check it against the manufacturers recommendation as if it isto thin then it will make your tappets unusally noisey if he has put in the correct oil then i would say that they were quiet because of the old gungy oil and they either need adjusting or if they are hydraulic then the lifters need replacing

Posted on Jun 01, 2009

  • 1026 Answers

SOURCE: Smoking from oil leak

air filtre also make sure your oil level is good check first thing in morning before starting car
to much oil can cause it to smoke

Posted on Apr 01, 2010

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