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Discussion Starter · #1 ·
I put straight 40wt. in the car, took a 500 mile trip, mostly xway, car ran like a clock but still knocking. Changed the oil to Rotella 15-40, plus added EOS from the Cadillac dealer. I replaced the EGR valve with the an original equipment one. Am preparing to take a 1500 mile trip through the mountains. Will keep my fingers crossed that all goes well. If I have a problem there's always U-HAUL.

Cob
 

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Discussion Starter · #9 ·
Hi again,

Took the Cadillac on vacation, 1500 mile trip through the mountains, car ran like a clock, except still knocking, even though I changed the oil to Rotella 15-40 together with EOS additive, replaced the EGR with original equipment, premium fuel was used also. Any comments would be greatly appreciated.

Cob
 
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