Originally Posted By: Artem
Based on some of the responses thus far, you'd think that doing extended OCIs is EXTREMELY DANGERIOUS and you have to assume all risk and expenses should something catastrophic happen to the engine during a 10-15k mile run on a synthetic oil GARANTEED by the manufacturer to be good for 20k miles... hmmmmm. Something doesn't add up here.
The way I see if, we have MORE THEN ENOUGH data on this site to suggest that, the OP will be TOTALLY SAFE to run an oil of his choosing for 2x the mantienance schedule without even a hint of any LUBRICATION RELATED failure if the UOA backed it up, showing that the oil is in good shape during oil change. What's the problem??
With today's 36-60k mile warranties, he'll be out of warranty and on his own in what, 3-4 oil changes? We all know that engine can last past the warranty period without even changing the factory fill, so I don't see what the fuss is about. If the lab report shows the oil is fine after putting on 2, 3, 5, or 10,000 MORE MILES then what the maintenance reminder suggest, then the OP should have NOTHING to worry about and he'll be past the warranty period with flying colors and a clean engine in no time at all.
Just my $0.02
I say you go for it, OP.
I don't think anyone is saying that it's dangerous to extend OCIs, rather they're saying that it's not worth the risk of losing warranty. In all reality, an extended OCI with a good synthetic won't cause harm, but no engine is perfect. If something breaks, it was probably going to break regardless of whether or not the OCI was extended with synthetic oil. However, it's a pretty safe bet that if your receipts show that you extended beyond the Manufacturer's OCI recommendations, they will more than likely fight you over warranty coverage. It may still be worth it to some, but if you strictly look at this from a value point-of-view, it's not worth the risk. Especially considering that the Honda OLM will already take you out up to 10k miles.