D.I.Y. oil changes vs. warranty
I'm a former car mechanic. I do my own maintenance and save my reciepts for oil, filters, and etc. I go an extra mile by using Honda filters (so a failure can't be blamed on an aftermarket filter) and I cut the UPC codes off of my oil and transmission fluid bottles and filters and save them (stapled to the approriate page in my maintenance book), to prove that the products were purchased. I've never had a warranty issue on my Honda, nor have I ever had a problem with warranty repairs on any car I have owned.
UPC is just an item number for the compter to use as a stock keeping unit. They only contain the manufacturer code, like Fram or Purolator and the item number. With this said quite a few manufaturers do put other information such a build-lot numbers or date of manufacture in the same vicinity, but not in the acutual code itself. With the code, the receipt and lot number for the parts, even if it is a Honda part, is more than enough to prove your case.
MFR guidelines?
A lot of fitfreaks don't seem to care but if you do your own oil changes I'd use the proper viscosity and grade of oil (as stated in owner's manual) and a Honda filter and save the documentation impeccably. When my 85 Toyota MR2's engine blew Toyota certainly wanted to see the maintenance documentation. My dealership only charges $29 for the oil changes and includes a 50 point inspection and tops off all other fluids in the car. I've always changed my own oil but, in this case, have Honda do it for the sake of perfect documentation. If anything goes wrong I'm pointing the finger right at them!
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