I'm an Amsoil dealer (I really should just be a preferred customer since I don't sell much) and run their Signature Series 5W-20 in our cars. Their 25K oil change is only if you use their filter and I, personally, like to change the filter and top off the oil at 12.5k miles.
With that said, I typically change the oil on our Mazdas at 10-15k intervals.
Normal Service(3) Up to 25,000 miles or one year, whichever comes first.
Severe Service(4) Up to 15,000 miles or one year, whichever comes first.
(1) Engines operating under modified conditions (non-stock) are excluded from extended drain recommendations. Examples include the use of performance computer chips; non-OEM approved exhaust, fuel or air induction systems; and the use of fuels other than those recommended for normal operation by the manufacturer.
(2) Mechanically sound engines are in good working condition and do not, for example, leak or consume excessive amounts of oil, are not worn out, do not overheat, do not leak antifreeze and have properly working emissions control systems. AMSOIL recommends repairing malfunctioning engines prior to the installation of AMSOIL synthetic oils.
(3) Personal vehicles frequently traveling greater than 10 miles (16 km) at a time and not operating under severe service.
(4) Turbo/supercharged engines, commercial or fleet vehicles, excessive idling, vehicles with more than 100,000 miles without prior continuous use of AMSOIL motor oil, daily short-trip driving less than 10 miles (16 km), frequent towing, plowing, hauling or dusty condition driving.
Ea Filters designated with product code Ea15K are recommended for 15,000 miles/one year, whichever comes first, in normal or severe service.
Ah I read that part of your previous post oddly. Makes sense to split the filter into 6-month rather than running it to the 15k mark. With how much you drive, you should look into the remote filter and bypass combo. Would allow you to run the 25k mile filter and add bypass filtration to boot, as well as increase oil capacity.if you don't go with their filter, you have to get under your car twice in a year, once to change the filter and oil, and then again after 6 months to change the filter.
A man after my own heart. (humpleg)I went with it because it was the best bang for the buck, and because I am lazy and like only having to mess with my oil twice a year.
There is only one 15,000 mile oil and that's Mobil 1 Extended Protection, none of the other oils warranty use beyond factory drains, and some stipulate their own change intervals for engine protection (Valvoline). AMSOIL is the only other one that extends drains and covers your engine. Even with Penzoil's top oil (Ultra) the terms are: "As long as you're within the owner's manual guidelines, you're good." So $9 a quart at factory drain intervals? Pass.I just hear guys arguing over which oil is the best: Mobil 1, Castrol Edge, Pennzoil Platinum, Valvoline SynPower, or Royal Purple, the list goes on. From what I read and it does seem that the consensus is that Amsoil is the best fully synthetic oil on the market, but for a daily driver or even a autocrosser with the stock 2.3 or 2.5 MZR motor, I don't think you could go wrong and see that much of a difference with the Mobil 1, Pennzoil or any one of the other 15,000 mile top tier fully synthetic oils on the market.
True, but the key thing to remember with that is the engineering and fit & finish in those engines is MUCH greater than ours. Metal quality and surface finish is UNREAL and their oil change intervals are much shorter and those engines hold sometimes double the amount of oil our MZR does. If we had 8 quart sumps, a generic API-SN rated oil could easily go 15,000 miles. Also note that MB (Ex MB 229.5 spec), Porsche (a40 spec) sets MUCH more stringent oil specs and requirements, such that they use a drastically different oil than our MZR. Setting the bar higher nets them a guaranteed level of performance to expect from the oil, which translates into holding up to increased strain those engines put on the oil.Porsche's, Mercedes AMG's, and the Nissan GT-R all come from the factory filled with Mobil 1 Synthetic oil. Nominal differences which for our engines is really just splitting hairs.
The 5's manual recommends oil changes every 3 to 5 thousand miles with 5W-20 grade oil...
The manual states to replace the oil/filter every 7.5k for schedule 1 (normal duty) and 5k for schedule 2 (rough duty). If you were running 20k per year, there's no way you were doing so and needing to change every 3-5k.
I don't even know why Mazda put it in the service schedule.
They do it so this way they can advertise long service intervals on TV or during sales pitch.
So for sanity's sake, I just wanted to clarify what the manufacturer's actual service intervals are not 3k miles - ANYWHERE.