Synthetic Oil Change Interval

Because of this superior ring seal with synthetic oil, oil consumption is often 1/2 or less of what it would be with mineral oil.

One experience with a little Nash 196 engine showed me how even a "hurt" engine can survive for a long time with a superior lubricant in it like Mobil 1. The Nash 196 has a bad reputation of being an engine with so much crankshaft flex that it is very hard on main bearings. The one I was driving had so much main bearing rumble that it would scare you to rev it up while under the hood. The main journals were worn and really should have been ground to get the journals straight and round, problem was that no undersize bearings were avalible for this obsolete engine. I did manage to find a set of standard bearings to put on the worn crank. The worn crank immediatly started to destroy the new bearings and the main rumble started to return within a few hundred miles. As a bit of a desperate experment, I drained the mineral oil and replaced it with Mobil 1 synthetic oil. This quieted the bearing noise which did not return during the 30,000 miles I put on that old engine over the next dozen years before finally putting the car into storage. In severe operating conditions,like bearings running on a badly worn crank, the POA based synthetic oil really showed how superior a lubricant it is.

For vehicles covered by a warranty, follow the vehicle's oil life sensor or the oil change interval recommended in your owner's manual. Follow your owner's manual if the vehicle is operated in any of the following severe services: racing or commercial applications including taxis, limousines, etc.; frequent towing or hauling; extremely dusty or dirty conditions; or under excessive idling conditions. If your vehicle has exceeded the duration of the manufacturer’s warranty, ExxonMobil warrants that the Mobil 1 Extended Performance lubricant you purchased will protect your vehicle’s critical engine parts from oil related failure for 15,000 miles or 1 year, which ever comes first. If not, provided the engine was serviceable at the time the oil was installed, Exxon Mobil will have your vehicle repaired and replace the oil at no cost to you.

Amsoil will warranty and repair your engine IF the oil was at fault, even with the extended drain intervals. You can purchase Donaldson filters that are also warrantied for the 15k and 25k intervals. Valvoline doesn't recommend extended intervals either. So if you only change your oil every 15k as opposed to 3-5k then you will most likely see a savings. Oh, and with the warrantied engines you would have to wait until about 100k miles before extending you intervals if you run anything but Amsoil.

AMSOIL INC. of Superior, Wisconsin hereby warrants that its lubricants are fit for use according to the written recommendations of AMSOIL INC. and in applications specifying one or more of the standards set forth in the product data bulletins and product labels. AMSOIL INC. further warrants its products to be free of defective materials, design, and workmanship.

THIS WARRANTY IS SUBJECT TO THE FOLLOWING LIMITATIONS: 1. This warranty only applies to AMSOIL lubricants for which a separate, specific warranty is not written. 2. The warranty herein applies only to AMSOIL lubricants, which are packaged by AMSOIL INC. and sold by AMSOIL INC. or an authorized distributor. 3. The liability of AMSOIL INC. shall be limited to: a. Replacement of the defective lubricant. b. The cost, including labor and materials, to repair damaged equipment, or at the option of AMSOIL INC., the cost to replace damaged equipment, resulting directly from the use of AMSOIL INC. lubricants when used in the proper applications. 4. AMSOIL INC. shall not be liable for special, incidental, or consequential damages including, but not limited to, damage or loss of other property or equipment, loss of profits or revenue, cost of capital, business interruption, lodging, towing, or cost of replacement equipment. The liability of AMSOIL INC. arising out of the manufacture, sale, delivery, installation, technical directions or recommendation of any lubricant- whether in contract, tort, warranty or otherwise - shall not exceed the value of the equipment in which the product(s) were used. The remedies to the purchaser herein are exclusive. 5. In the event of a claim against AMSOIL INC., the procedure below must be completely followed. a. Where the original warranty from the equipment manufacturer is still in effect, the customer shall file a warranty claim with the Original Equipment Manufacturer (OEM) in accordance with the OEM warranty procedure. b. Customer shall retain failed parts for inspection by AMSOIL INC. unless given to the OEM. c. Customer shall also, within 30 days of failure, notify AMSOIL INC. and provide the following: (a.) An eight (8) ounce representative oil sample taken from the failed equipment and put into a clean container. (b.) Documentation including make, model, and year of equipment, total accumulated miles and/or hours, and duty cycle or service environment. (c.) Equipment or vehicle maintenance history documentation including miles or hours at the time of AMSOIL lubricant installation, general equipment repairs, and oil analysis results if available. (d.) Proof of purchase for AMSOIL lubricant. (e.) Batch number from oil container or Certificate of Analysis. d. Mail the above sample and information to:

AMSOIL INC., Attn: Technical Services
AMSOIL Bldg.
Superior, WI 54880 e. In cases where the OEM warranty is still in effect and that warranty coverage is denied based on the use of an AMSOIL lubricant, the customer shall immediately notify AMSOIL INC. and provide a written copy of the OEM warranty denial. f. AMSOIL INC. may, at its option, notify its insurance carrier of the claim. g. AMSOIL INC. or its insurance carrier may conduct an investigation that includes, but is not limited to, an inspection of the failed parts, a review of the operating conditions, and a thorough review of the information requested above. The customer agrees to cooperate with such investigation. h. If AMSOIL INC. or its insurance carrier pays a claim, an attempt may be made to recover amounts paid from the OEM. If this occurs, the customer may be asked to provide further information pertaining to the failure and to cooperate with AMSOIL INC. or its insurer in the recovery process.

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Why would ANYONE let a rebuilt engine IDLE for 45 minutes?!?!? No wonder it locked up...

I also change my oil outdoors. Much nicer not to change oil in the winter.

Regular oil does not have the additive for non roller cam follers any more. My 77 vette gets synthetic for its construction.

My brother drove a 96 Camry a little over 400k with amsoil.

When I blew a head gasket on my 98 venture, I was thankful it had synthetic, as it had no internal engine damage. New gaskets and it was back on the road. Still have it, long ways to go, only 149k.

My personal experience is with a 98 chevy pickup that is still running great at 430,000 miles. It ran the first 100,000 on mineral oil, then was converted to mobil 1. It seems that you can put Mobil 1 synthetic oil into a good running, high mile engine, and what ever condition it was in at the time,will not change seemingly forever. Wear almost stops if you maintain a good air filter system.

That van has had several change done at 16,000+ miles.

Got a good friend in Kentucky that has a Dodge truck with a Gertag transmission that was eating shifter forks. He was replacing them about every 18 months or so. I think it's a 91 model. I called the Amsoil Tech and asked what to use in it. It had 10w-30 engine oil in it. I figured Amsoil would have some type of gear oil for that application. The tech told me to use 10W-30 in it. I shipped him some and it's been going over 4 years now and no more shifter forks have gone bad. He's been happy with it too. Solved a big problem for that transmission. He sells horse hay and is on the road selling about 30,000 bales per year. He was about ready to sell that old truck because of the shifter problem.

Here is an interesting independant oil life study using Mobil 1 and Amsoil pure synthetic.
Both are premiun POA synthetic oils.

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If I ran strictly highway miles I'd go at least 7500 miles if not 10,000. Check out bobistheoilguy.com forums for some more info and the link below for one guy's study with synthetic oil.

• Synthetic oil life study