Motor oils are blended using base oils composed of petroleum-based hydrocarbons, polyalphaolefins (PAO), or their mixtures in various proportions, sometimes with up to 20% by weight of esters for better dissolution of additives. Motor oil may be composed of only a lubricant base stock in the case of non- detergent oil, or a lubricant base stock plus additives to improve the oil's detergency, extreme pressure performance, and ability to inhibit corrosion of engine parts. In addition to the aforementioned basic constituents, almost all lubricating oils contain corrosion and oxidation inhibitors. It also neutralizes acids that originate from fuel and from oxidation of the lubricant (detergents), improves the sealing of piston rings, and cools the engine by carrying heat away from moving parts. The main function of motor oil is to reduce friction and wear on moving parts and to clean the engine from sludge (one of the functions of dispersants) and varnish (detergents). They typically consist of base oils enhanced with various additives, particularly antiwear additives, detergents, dispersants, and, for multi-grade oils, viscosity index improvers. Motor oil, engine oil, or engine lubricant is any one of various substances used for the lubrication of internal combustion engines. Pouring fresh motor oil into an engine Different brands of bottled motor oil at a store

Reinsert automatic transmission fluid dipstick fully.Not to be confused with fuel oils used as motor fuel.

CAUTION: DO NOT OVERFILL OR SPILL AUTOMATIC TRANSMISSION FLUID ON HOT ENGINE PARTS! Carefully add automatic transmission fluid in small increments and recheck level each time until fluid level reaches 'warm' line.

Insert long funnel into automatic transmission fluid dipstick hole.

If the automatic transmission fluid level does not come up to the 'warm' line, you'll need to add automatic transmission fluid. Your dipstick might have two markings for 'full'-one warm, one cold. Wipe clean, reinsert fully and remove again.

Remove automatic transmission fluid dipstick.

Locate automatic transmission fluid dipstick, typically near where the transmission or transaxle meets rear of the engine.

(Be aware that some automatic transmission fluid levels are checked with the engine off. Let engine warm up and continue to run throughout operation unless vehicle's owner's manual says otherwise. Park vehicle on level surface, engage parking brake and start engine.Step-By-Step Instructions For Checking Your Vehicle's Transmission Fluid

Is there a way to test oil viscosity