Do automotive oil additives really protect your engine?

From STP oil treatment to Slick 50. Do they work?

13 Answers

  • Rich
    Lv 4
    1 decade ago
    Favorite Answer

    never ever put an additive in a new car. I dont suggest any additives until at least 45 to 50 thousand miles. On todays cars, 60 to 70 thousand miles.

    Stp is just an oil honey. It makes the viscosity thicker so it clings longer than oil by itself would. I found stp to "hold" dirt.

    Lucas seems to be the best treatment I have found for high mileage motors, especially ones with weak oil pressure from poor main bearings.

    It does a nice job of creating a "buffer" inbetween the bearings and is formulated to keep it clean.

    Alot of additives are "paraffin" based, Thats right, WAX! those are the ones to stay away from. Penzoil and a couple other motor oils used to be pariffin based oils.

    Slick 50. It says in the pamplet that comes with it in the box, do NOT put in a new car. It will not let the rings seat. Only for high mileage motors. amazing what one learns by reading!

    But I am a beleiver in that product in this respect.

    I had an Olds 88 with a 4.3. 126 thousand miles on it. Used slick 50 in it since it had 100 thousand miles. It seemed to make the motor run cooler. Major sale point for me was it was 3 in the morning and I was in Galesburg Illinois. The oil sending unit blew. All the oil blew out onto the underside of the hood and firewall. I had no oil. I just said the hell with it and drive it. I drove that car into my driveway in Peoria Illinois and shut it off. The lifters just started to make noise a few blocks from my house. In the morning, I put a new sender and fresh oil and drove that car another 32 thousand miles and sold it with 158 thousand miles on it! The lifter noise went away within 10 minutes of running it with oil when that happend.

    So I have to beleive in slick 50. Whatever that polymer is in it, clings like crazy and actually worked for me.

    I own 2 shops now and recommend that product on all cars with over 100 thousand miles.

    I recommend Lucas for all cars with low oil pressure that people dont have the money to repair correctly

  • geiser
    Lv 4
    4 years ago

    Engine Oil Additives

  • Anonymous
    1 decade ago

    Slick 50 works for me - it does NOT act as a viscosity improver, but adds teflon to the engine and allows it to work into the crevices as an anti friction agent. It does eventually filter out over a period of a few years - I noticed on first application a significant 20 pound improvement in oil pressure and no more rattling lifters. That was five years ago and I ran that particular car down to one quart due to a severe leak more than once.

    I'm still driving it and the pressure needs pumping up again - and the pesky lifter is rattling again at idle. I'll pick up another quart next time its on sale and do it again. It's a '90 Cherokee with over 175,000, and I don't plan on getting rid of it yet.

    Other additives are much less helpful - STP for one, as all it does is boost viscosity, just like a 50 weight oil change. The most specific additives are becoming a lot more helpful, zinc phosphate the most. It has been reduced in the latest SM rated oil to reduce emissions and because modern roller lifter engines don't need it - but older flat tappet motors, especially those just rebuilt, desperately do. GM offers a "new engine assembly lubricant," which they used to sell as just an additive, which is zinc phosphate, with a good reputation in the industry.

    Some other additives, such as Seafoam, or Rislone, will do what they are marketed for - clean out the gunk from engines used in stop and go suburban commuters, but the rest can be really difficult to accept unless you have direct experience with them - like the latest marketed push in the big white jugs. That wasn't any better that STP, and racers claims that it works don't show up in the winner's circle. It's just a sponsorship paid claim.

    Zinc phospate is still in 10-40 oils and thicker, older grades. But for all the rest, it's largely snake oil, except for teflon, moly disulphide (another racer's secret,) and zinc phosphate.

    Source(s): Asc Auto Tech, ASE Parts, 35 years fixing my own cars.
  • 5 years ago

    This Site Might Help You.


    Do automotive oil additives really protect your engine?

    From STP oil treatment to Slick 50. Do they work?

    Source(s): automotive oil additives protect engine:
  • How do you think about the answers? You can sign in to vote the answer.
  • 1 decade ago

    My father has been a mechanic for over 36 years. He had previously rebuilt a motor on our pickup. We had been running Mobil 1 Synthetic oil and had also put in Slick 50 once. He said that the inside of the engine looked extremely clean and almost new in some areas.

    We put Mobil 1 in a few other vehicles. In one of our pickups, it seemed to start using (burning) the oil afterwards. We didn't worry too much and simply added what it needed between oil changes (every 5000 or 7500). We never had problems with those engines.

  • 1 decade ago

    As a master mechanic when Slick 50 first hit the market, and having customers try it in diesels, I can say that it does seem to work. A diesel's oil comes out black, and stains even your fingers if it touches the skin. After S50 was added, the oil came out looking like it was from a gas motor, a reduction in blow-by and less build up of inpurities. STP and other types of "motor honey" simply thicken the oil, you may as well go to a 20w50 and not use the additive. These additives have their place, and can make a short term repair rather easily, but I don't personally recommend them for long term use. The best thing to do is to follow the vehicle manufacture's oil change and weight guide.

  • 4 years ago

    Oil Additives That Work

  • 1 decade ago

    Short answer is no.

    Each year oil company's spend thousands of dollars to formulate an oil with the right detergents, anti oxides, anti foam and other additive

    They work on these to get the formula just right so that they don't conflict with each other and cause problem by making it less effective.

    Using an additive can make this formula less effective than straight oil.

    Source(s): 30 Year ASE Master Tech
  • 1 decade ago

    I have two trucks. Both started getting Engine Restore at 75K and never had a problem with either, but did a little boost in fuel economy. I don't buy into synthetics being so much better either, if you live in a warmer climate like myself. I used a name brand and change it regularly with a quality filter. That's the best thing you can do for a motor.

  • Anonymous
    1 decade ago

    generally no

    you'll notice such stunts as draining the all the engine oil and then running the car dry to prove a point in the commercials always come with a warning never to attempt ( why not.. the engine is protected isn't is according to the commercial ? )

    Mobil 1 is probably the one motor oil with a proven track record, but since it is designed to be changed at much farther intervals, and as such violates manufacturer's warranty for doing so

Still have questions? Get your answers by asking now.