My GMC Canyon takes 5-30 and there is no alternative, but thats oK with me. There are still some GM engines that use 0-20. I did read that that was a fix for cam chains in the 3.6 V6, but i believe the problem has been fixed or so they say. i will probably use M1 5-30 DEXOS when I have to do my own oil changes. I ran Shell Rotella for small trucks in a GMC Envoy for a while and it was good oil. I may even use that as I am not a Pennzoil fan.
Yep, the timing chain issue was resolved years ago on the GM 3.6.
The GM 3.6 started off as a port injection engine (code LY7), and it had a tendency of wearing out timing chains. These engines aren’t favorable for long oci’s due to the long chains.
GM came out with the 3.6 direct injection (code LLT) for the 2009MY and it was quickly discovered that timing chains were failing. GM discovered that some LLT engine had improperly heat treated timing chain components, so they issued an extended warranty for the engines involved. IIRC, it extended for several model years. GM then issued a recall to recalibrate the OLM for vehicles equipped with LLT engines, shortening the OCI considerably.
The next 3.6 DI (code LFX) was the LLT replacement and was extensively reworked and does not have any known issues. It’s a solid engine.
Then there’s GM 3.6 DI (code LGX) which is the most recent iteration, it is based on the LFX but incorporates cylinder deactivation and auto start/stop.
To date, the LFX has no know design or durability issues. Expect normal rate of engine failure compared to the rest of the industry.
The LGX is still fairly new, but to my knowledge it doesn’t have widespread issues.
Regardless of which GM 3.6 one has in their vehicle, oil changes need to be on time. All the 3.6 DI engines should have the shortened OCI in the OLM. If you have an LLT engine, call your dealer and confirm the recall has been performed for the OLM recalibration. If you have the LY7 port injection engine I would change the oil at 5K miles. The OLM will let you take it to 10k+ miles on the LY7, the ones I’ve seen failed had extended and skipped oci’s.