Adam F Posted August 17, 2004 Report Share Posted August 17, 2004 What oil must I use in my OB?? I have a 1999 Mariner 50hp 4 stroke. I have been using the pukka Quicksilver jobbie, but was wondering if car engine oil can be used? Not too bothered as uses very little - but have loads of car oil doing nowt in garage. Quote Link to comment Share on other sites More sharing options...
Afishionado Posted August 17, 2004 Report Share Posted August 17, 2004 What oil must I use in my OB?? I have a 1999 Mariner 50hp 4 stroke. I have been using the pukka Quicksilver jobbie, but was wondering if car engine oil can be used? Not too bothered as uses very little - but have loads of car oil doing nowt in garage. Aaaaaaaaaaagh!!!!!!!!!!!!!!!!!!!!!!!!!!! OK maybe a bit over the top but......... O/B oil is especialy formulated to burn yet lubricate at the running temperature of an O/B. In a pinch one can use ordinary two stroke oil for use in aircooled M/C engines which run just a bit hotter than O/B's . BUT car engine oil NEVER!! Car engine oil lubricates in an entierly differant way. Firstly it is designed to be recycled by going through the engie via the filter many times. This means that it's burn temperature is much higher so if used in a two stroke it will not be fully burnt on the exhaust stroke of the pistons and a gooey residue will quickly build up. This residue will be quite harmfull to the engine in many ways. Mad Mike Quote Link to comment Share on other sites More sharing options...
Adam F Posted August 17, 2004 Author Report Share Posted August 17, 2004 ....but if you read the post I have a 4 stoke???!! I know how oil works in a 2 stroke....but isnt a 4 stroke similar in many ways to a car? Quote Link to comment Share on other sites More sharing options...
Newboy Posted August 17, 2004 Report Share Posted August 17, 2004 The answer is pretty simple. What brand oil do you (plan to ) use for your Rav 4?If you take it to a Toyota garage, they will properly use Castrol or Durnham or something which they buy in @ 100 litre drum. Then, you may ask, why are there so many brand of oils and the costs can vary between Quote Link to comment Share on other sites More sharing options...
Afishionado Posted August 17, 2004 Report Share Posted August 17, 2004 ....but if you read the post I have a 4 stoke???!! I know how oil works in a 2 stroke....but isnt a 4 stroke similar in many ways to a car? Well bugger me I didn't see the bit about yours being a four stroke That's a whole kettle of a differant worm A very good question and one I admit to not knowing the answer to but......... A cars engine has a pressurised water cooling system that works above the normal boiling point of water. Therefore the lubricant is designed to work within the temperature gradients apparant in a modern 4 stroke cars (pressureised cooling) system. However I think that your O/B will have a direct water cooling system and therefore work at under the boiling point of water. This being the case the specified O/B oil may be of a lower viscosity because it runs at lower temperature than automobile engines. Having said that there are some high spec low viscosity oils available for the motorist but I bet they cost more than the pukka O/B stuff. Mad Mike Quote Link to comment Share on other sites More sharing options...
Bob F Posted August 19, 2004 Report Share Posted August 19, 2004 Adam, did you get a manual with your engine? If not, it would be worth getting one from the web. The manual will tell you the type of oils you can use (type number). My Suzuki 4 stroke will run with normal four stroke motor oil used in cars. You can use any oils which are rated SE, SF, SG, SH or SJ under the API classification system (whatever that is ). The viscoity rating should be SAE 10W-40, ideally, or if you cannot find this, the following are ok but with a smaller temperature range. 10W-50 15W-40 15W-50 20W-50 cheers Bob F. Quote Link to comment Share on other sites More sharing options...
Adam F Posted August 19, 2004 Author Report Share Posted August 19, 2004 Nice one Bob...Ill have a gander! Quote Link to comment Share on other sites More sharing options...
Coddy Posted August 19, 2004 Report Share Posted August 19, 2004 Hi Adam You have the same engine as me but the 50hp version. Handbook says: (Quote) SAE 10W-30 viscosity oil is recommended for use in all temperatures. SAE 25W-40 viscosity oil may be used at temperatures above 40F (4C) Use Quicksilver or Mercury Precision Lubrucants 4-stroke outboard oil or 4-cycle marine engine oil with the proper viscosity for the expected temperature in your area. If not available use a premium quality 4-cycle engine oil, certified to meet or exceed any one or combinations of the following American Petroleum Institute (API) Service Classification SH, SG, SF, CF-4, CE, CD, CD11 (End quote) Seems like you can use a good quality car engine oil with out any problems. Out of interest can you advise me how much the oil filter is as I need to carry out an oil change on my engine. Regards Coddy Quote Link to comment Share on other sites More sharing options...
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