LiquiMoly?
 

Back in the late 1970's Stalube offered a motor oil containing molybdenum sulfide which could be found in some of the high end auto-parts stores. It did not seem to be that popular with cheap gas. I used it and found it to increase mileage. Then one day it seemed to vanish and has never returned.

Recently I stumbled on to a molybdenum sulfide containing oil additive made in Germany at the local AutoZone store. LIQUIMOLY is the name of the product offering claims of decreased wear, less engine noise, cooler operating temperatures and better mileage, what is not to like? Found some good reviews on Amazon for the anti-friction additive.

Bigger question is has anyone on this site tried it out in their vehicle and found it to deliver on the claims?

I bought a 300ML container and will be adding it to the crankcase with the next scheduled oil change sometime next week. Will be interesting to see how it works many decades later in a fuel injected turbo engine.

And if oily fumes get into the MAF it will also give lots of issues. If any is burnt then the residue will also foul the O2 sensor causing fuel consumption and driveability issues.

Best advice is "don't" for anything that is fuel injected.

Simon

My dad loves the stuff and has never had any issues with it.

As for me, I would rather use the money for those additives on buying better oil.

Yep. You dad has been lucky, and probably has an engine that is in good condition. I am a believer in using the correct oil with few additives that are not "designed in".

Simon

He's a firm believer in them and has used molyslip in all of his cars.

All have been low milage cars with good engines, and all of them died of rust.

Car manufacturers (and the oil companies) have no doubt tested them and found little or no benefit other than the weight reduction to the wallet, that is why they are not recommended.

I would however love to be proved wrong.

I used to swear by it too, but that was in the days when a 1600cc engine making 140hp would do 150,000km between rebuilds (the old ford crossflow in escorts). Now, materials, production quality and lubrication has come so far that much higher stressed engines last three times as long. Controlling fueling with EFI reduces oil contamination and bore washing, reducing the need for moly and similar additives.

Simon

The anti wear addtives and oil detergent disbursant in all oil can also clog the catalytic converter too.

I used liquid moly 10w-40 engine oil in my previous '94 celica.

very good cold performance, no noise from the engine compared to mobil engine oil

Didn't even consume the oil so much, even with 150K miles on it, in the 3sge that is famous of becoming thirsty on oil as it advances in kms.

Emissions were good, I drove a year and no probs with MOT.

Should try the stuff in the warwagon. (which has a engine designed in the 70's)

Many off-the-shelf oils contain molybdenum, a number of them in disulfide form. Mobil, Castrol, Pennzoil, and Quaker State all use it as an anti-friction/anti-wear additive. The Petroleum Quality Institute of America tests oils regularly, including additive content, and "moly" is one of the additives they test for. Their testing is often responsible for the removal of substandard motor oils from the market.

Here's their results for Mobil1 Advanced Fuel Economy 0w20 from earlier this year: Mobil 1 SAE 0W-20 Full Synthetic API SN/ILSAC GF-5 dexos1

Quaker State Ultimate Durability has over three times as much as Mobil1.

When I have used it the engine temp has been lower as shown by my scangague. I cant measure friction but the temp drop is definitely there.