I want to discuss this before getting suckered into one more oil additive that is a waste of money. I admit I did buy Slick 50 once or twice in 90's ($20 IIRC) only to find out later it only plugged the filter. More recently, a year ago, I purchased biotech additive (incidentally $20 per quart too) that did squat for the engine noise that I have (made it worse).
I did some searches and some results are not encouraging:
#1 This is an old, but big study:
Quote:
A 55-taxicab fleet test was conducted for 160 000 km
Quote:
Adding either graphite or MoS2; to an SAE 5W-30 engine oil did not affect oil economy or oil performance, but oil filter plugging was increased in high-mileage cabs. Oil filter plugging increased with increasing engine oil viscosity, filter change interval, and cab mileage.
source here: http://papers.sae.org/821227/
#2 This paper shows effects, but at the treat rate of 1% solids!
Quote:
The paper provides details of dynamometer, track, fleet, and leased car tests sponsored or conducted during the period 1963-1974. The data show an average improvement of 4.4% in fuel consumption results from the proper dispersion of 1% weight molybdenum disulfide (MoS 2 ) in the engine oil.
Source: http://papers.sae.org/750674/
We know that the popular additive LM2009 gives only 0.15% solids at the full treat rate.
#3 The well-known company Liqui Moly that markets MoS2 also sells a number of good oils, but only selected few of them contain MoS2.
#4 The modern oils already contain soluble MoDTC that generates MoS2 in situ when friction is encountered.
Based on these facts, how would you convince me that MoS2 additives actually work in modern engine oils rather than just plug oil filters?
Thanks!
I did some searches and some results are not encouraging:
#1 This is an old, but big study:
Quote:
A 55-taxicab fleet test was conducted for 160 000 km
Quote:
Adding either graphite or MoS2; to an SAE 5W-30 engine oil did not affect oil economy or oil performance, but oil filter plugging was increased in high-mileage cabs. Oil filter plugging increased with increasing engine oil viscosity, filter change interval, and cab mileage.
source here: http://papers.sae.org/821227/
#2 This paper shows effects, but at the treat rate of 1% solids!
Quote:
The paper provides details of dynamometer, track, fleet, and leased car tests sponsored or conducted during the period 1963-1974. The data show an average improvement of 4.4% in fuel consumption results from the proper dispersion of 1% weight molybdenum disulfide (MoS 2 ) in the engine oil.
Source: http://papers.sae.org/750674/
We know that the popular additive LM2009 gives only 0.15% solids at the full treat rate.
#3 The well-known company Liqui Moly that markets MoS2 also sells a number of good oils, but only selected few of them contain MoS2.
#4 The modern oils already contain soluble MoDTC that generates MoS2 in situ when friction is encountered.
Based on these facts, how would you convince me that MoS2 additives actually work in modern engine oils rather than just plug oil filters?
Thanks!