2000 Chev Silverado 4.8 V-8 Pennzoil 5w-30 1500 miles / 4 mo

Status
Not open for further replies.
UPDATE:

Report came back with no coolant!

Mike, you were correct!
worshippy.gif


New UOA 4000 miles


Take care, bill
biggthumbcoffe.gif
 
"DEX-COOL"(tm) is not a specific chemistry. It's a GM extended-life coolant performance spec. GM Mr. Goodwrench DEX-COOL(tm) (made by Texaco originally, but now supplied by Chevron) contains the hydrated potassium ("K") salt of 2-EH as its OAT component. Prestone licensed DEX-COOL(tm) uses the hydrated sodium ("Na") salt of 2-EH and further lists the hydrated sodium salt of neodecanoate as the OAT components. Since Bill of Utah used the Prestone version, Na contamination of the motor oil would be expected if the engine was one of GM's notorious internal leakers. Fortunately, Bills last update tested negative for glycol contamination, so the Na was expected leftover from the previous Mobil Clean 7500. Had the report come back positive for glycol, it would have coincided perfectly with Prestone DEX-COOL(tm) contrary to Michael's analysis. Congrats, Bill - you dodged a bullet.
 
Status
Not open for further replies.
Back
Top