Assembling a gasoline puller engine, short block has about 50 hour on it, had been running Rotella T with a Lucas zinc additive. Every thing looks ok but a lot of breather stink and enough carbon on pistons, run it in another puller and one of our farm tractors and the same thing, breather stink and enough smoke off idle etc. I have run Case/IH bulk, Valvoline, Chevron etc over the years, all good oil. Right now I'm running Amsoil 15/40 in the diesels and 5/30 in the car and pickup and stretching the drain some, but within reason and am having real good luck with this plan. Any way I'm thinking of running Valvoline full synthetic racing oil (20W50) in this engine, I know this subject has been beat to death here, but what do you think?? Racing oils have zinc already in them and are suppose to let an engine develop a little more power according to there statements and specs, baloney or truth?? Thanks for your thoughts.
 
I had been using Rotella in my 93 Chevy turbo 6.5L. It threw a rod at about 178K miles. GM service manager said that Dodge and Ford discourages using Rotella, GM hasn't yet taken a position on it. My 02 GMC 6.6L Isuzu is using Delvac.
 
I have a Shell Rotella 15X40 story, this is just a story. Not Scientific. I was selling diesel to a contractor who was building a landfill. They had 8 or nine Quad-tracks pulling two dirt pans each, and other related equipment. They wanted Rotella 15X40 oil (what they had always used) They wanted a barrel every time I took them diesel(2500gal). We had 8 barrels in stock. Though this would be enough. We were mainly a Valvoline dealer, but handled all brands. Well we ran out of Shell. So I took them Valvoline AllFleet 15X40. After about 3 barrels of Valvoline, the foreman called and said no need to bring another one this time. Our oil use has been cut in less than half with the Valvoline. Shouldn't have let them try Valvoline, if we wanted to make more money selling them oil!
 
(quoted from post at 08:45:06 08/04/13) Assembling a gasoline puller engine, short block has about 50 hour on it, had been running Rotella T with a Lucas zinc additive. Every thing looks ok but a lot of breather stink and enough carbon on pistons, run it in another puller and one of our farm tractors and the same thing, breather stink and enough smoke off idle etc. I have run Case/IH bulk, Valvoline, Chevron etc over the years, all good oil. Right now I'm running Amsoil 15/40 in the diesels and 5/30 in the car and pickup and stretching the drain some, but within reason and am having real good luck with this plan. Any way I'm thinking of running Valvoline full synthetic racing oil (20W50) in this engine, I know this subject has been beat to death here, but what do you think?? Racing oils have zinc already in them and are suppose to let an engine develop a little more power according to there statements and specs, baloney or truth?? Thanks for your thoughts.

I use valvoline 20/50 racing blend. It is not synthetic, but is a racing blend. Used it for years in my race engine
 
All Cummins engines comes from the plant with Valvoline Premium Blue in them now and that is the oil Cummins recommends. Cat now uses Mobil oil that is branded as Cat oil in all their equipment. Both companies used to swear by Rotella for years. Rotella is definitely not the oil it once was, that is for sure.
 
That's interesting I got that in my 99 7.3 ford diesel. Is the most expensive oil I've ever put in a truck and used nearly all the pail! . Maybe it will be coming out before the mileage is up after your comment. Most guys round here swear by it.
Regards Robert
 
I highly recommend Schaeffer's 20w-50 synthetic blend eace oil. It has extra zinc, & ive STOPPED oil consumption in several engines now with it. Its so slippery you cant hardly work on the engines insides. Get on your hands & you cant hold a thing. Its $5.41 a quart. They make other weights &a results are the same.
 

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