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I thought only 5W30 and 10w30 were recommended for this engine. 5W40 in Colorado seems a little thick. What does your owners manual recommend?
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....Not to thread jack, and to any who can answer, but is there any issue running Rotella-T in a car with a cat. converter?
Does this oil "poison" the cat.?....
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....Not to thread jack, and to any who can answer, but is there any issue running Rotella-T in a car with a cat. converter?
Does this oil "poison" the cat.?....
IMO, this would only be a concern if the vehicle burned a LOT of oil. RTS 5w40 carries an API SL gas-engine rating. If there was a signifigant issue with this oil harming catalytic converters, I can't imagine that it would ever have been able to achieve the API SL spec. Someone please correct me if I'm all wet.
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Also what happends if my cat does go out on me? How will it effect the way the car runs? Thanks!
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BTW; as far as I know ALL years of the LS1 f body were speced (according to the manual) for SJ oils, so the add packs in the Rotella T syn.'s SL rating will still enable you to get a new catcon under GM's TSB/extended cat warranty, EVEN if the oil possibly caused the damage.
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The 4.3 in my 1995 Blazer loved the stuff. Sold it at 171k and it was running fine. Never had a problem with cat poisoning either.