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Would you use 5 year old Amsoil Synthetic Severe Gear Oil (unopened 75W-90) in the differential of a well maintained vehicle with 100K miles? Differentials were changed twice before. Application is a 2013 Subaru Outback.

Would you pay $190 for a Sears AGM battery (through Amazon) or $135 (out the door) for a Walmart Everstart Maxx by Johnson Controls? https://www.amazon.com/gp/aw/d/B077741997/ref=ox_sc_act_image_1?smid=ATVPDKIKX0DER&psc=1...

Can Peak Long Life antifreeze be used in all aluminum engines such as on a 3.6L Subaru Outback? It has 2-EH in it and is free of other harmful contaminates. https://peakauto.com/products/antifreeze...ASACEgLJ4_D_BwE

Question: I have two unopened 12-oz cans of R-134A refrigerant sitting in my garage for the past 5 - 6 years: are they still good to use?

Concerning the thinner (more shear stable) Dex VI and Toyota WS auto transmission fluids....., has there been testing or studies performed to determine how long a late-model transmission will last compared to those that use more viscous fluids (which tended to shear more)?

New 5W-20 weight oils tested: * Valvoline White Bottle SN, GF-5 * Service Pro Synthetic Blend SN, GF-5 * Speedway SN, GF-5 * SureGuard SM, GF-4 * Delfin Ultimate SM, GF-4...

Came across these two studies where Mobil 1 and Amsoil were put in the same (GM LS1) engine and an oil sample taken every 1,000 miles. Mobil 1 5W-30: http://www.brianschreurs.org/neptune.spacebears.com/cars/stories/mobil1.html#metals Amsoil ASL 5W-30...

http://www.pqiamerica.com/March2013PCMO/HDEO%20SUMMARY.html

Have been reading about the tri-nuclear moly additives and have a couple of questions: http://www.infineum.com/Documents/Crankc...logy%202009.pdf 1. Does Lubro Moly MoS2 clash with the more modern Infineum Tri-Nuclear Molybdenum? 2. Does Lubro Moly's version fully activate at about the same...

PQI America has a simple chart on the evolution of engine and transmission fluid going back to 1930. http://www.pqiamerica.com/timeline.html?utm_source=Copy+of+May+29+2013+&utm_campaign=June+3%2C+2013&utm_medium=email

LubriGold® Synthetic 5W-30 API SN, ILSAC GF-5, Dexos™, from Warren Oil Company: http://www.pqiamerica.com/March2013PCMO/lubrigold.htm?utm_source=Copy+of+May+29+2013+&utm_campaign=June+3%2C+2013&utm_medium=email CAM2® SYNAVEX™ 5W-30 API SN, ILSAC GF-5...

Looking for a LONGER Fram Ultra oil filter - book calls for a XG9688 that fits both of the following vehicles: * 2013 Subaru Outback H6 3.6L * 2005 Kia Sorento 3.5L Fram's websight isn't helping much and company technician says it's again policy to provide alternatives other than the XG9688.

For those who purchased extra oil filters and let them sit on the shelf for a few years........ What is the life expectancy of new oil filters? Doesn't the filter media and gasket material get brittle or harden up over time?

P0456 - "Very Small Leak in Evaporative Control Emission System". Application is a well maintained 2005 Dodge Neon SXT with 117K miles. Having a challenging time finding the "Very Small Leak in Evaporative Control Emission System". Fuel cap was replaced at 112K and visual inspection hasn't...

Engine Design Question: Have the piston to cylinder wall CLEARANCES in new engines changed over the past 20+ years?

Have a 2013 Subaru Outback 6-cylinder: In 2 or 3 years (when the coolant is replaced at 36K) what coolant should I use? Thank-you in advance of your expertise.