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Old 03-08-2016, 04:37 PM   #1
gossboy87
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Default 1995 yamaha oil type, synthatic or no.

I was wonder what kind of oil is the best for my 95 stock Yamaha with life. oil type and is it just 1 quart thanks
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Old 03-09-2016, 05:41 AM   #2
spriddle
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Default Re: 1995 yamaha oil type, synthatic or no.

One quart, 10w30. I'd just stick with conventional especially if the engine has age to it (which I'm sure it does). Synthetic oils contain cleaning agents that can cause leaks around aged engine seals and gaskets.

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Old 03-09-2016, 07:33 AM   #3
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Default Re: 1995 yamaha oil type, synthatic or no.

Almost all oils contain certain types of detergents, each brand having their own formulas. The biggest reason that synthetic oil "leaks" on high mileage engines is the oil molecules are smaller and will seep past old dried gaskets.

But I'll agree with Spriddle, probably conventional is "good enough" for an old engine. The trick with small engines is keeping the oil clean, which means changing it often. The extra cost for synthetic at this point is just wasteful spending.

However, if your engine is new/rebuilt...synthetic will offer you some benefits, but you won't likely notice. Decreased wear being the biggest. It will run better when cold. It will use less fuel. It will last longer, provided you use a filter. But in an air cooled small engine, it probably is very marginal, not noticeable.
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Old 03-09-2016, 09:00 AM   #4
raydhd
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Default Re: 1995 yamaha oil type, synthatic or no.

I have syn oil in everything that burns fuel new or old.In every case the extra lubricity of the oils shows.The engine revs better and in almost every case the idle screw had to be turned back.I have not seen it cause any oil leaks and then doing something inside the engine such as adjusting valves the parts are noticeably slicker.There is my .02 cents worth as some else here put.
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Old 03-09-2016, 09:42 AM   #5
Mike Mac
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Default Re: 1995 yamaha oil type, synthatic or no.

Conventional oils are so good today, I think there is "really" very little difference between them. It's the "feel good factor"$$
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Old 03-09-2016, 01:12 PM   #6
raydhd
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Default Re: 1995 yamaha oil type, synthatic or no.

The syn oils take heat a lot better than conventional oil and heat is a big factor in air cooled engines. A number of harley engine builders looked at whether syn oils helped older harley engines not designed for syn oil. They found that definitely increases engine life.
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Old 03-09-2016, 10:59 PM   #7
cgtech
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Default Re: 1995 yamaha oil type, synthatic or no.

I sometimes run Amsoil in my old G2, it seems to consume it a bit faster than conventional oil. I dont have any notable oil leaks & synthetic does not seem to cause any. The benefit is no more gummy sludge on the inside of the oil cap (or inside the crankcase i hope). The funky buildup is often attributed to the crap in todays fuels.
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Old 03-10-2016, 10:16 AM   #8
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Default Re: 1995 yamaha oil type, synthatic or no.

Some good posts in this thread. I have used about every brand of oil there is and cut open so many oil filters and studied them it's crazy. I used to be a Mobil 1 fan. And it is still a top notch oil. Amsoil and Royal Purple are about the best you can get. If you're looking for a good conventional oil, Pennzoil is about the best out there. And at one time, not sure that it still is, it was what Walmart had in there blue Super Tech jugs.

And Slonomo is right, the molecules in synthetic are a lot smaller from what I've read years ago.

If I remember right, it was Porsche that would not run synthetic oil in their engines because it continually destroyed the seals because of the cleaning agents in the oil. I could be wrong and you'd have to look it up. But, I think I am right on this. And it was years ago. Oil has went a long way since then.

I now personally run Walmart oil in all my vehicles with a Wix (Napa Gold is the same thing) oil filter. The biggest thing with oil is KEEP IT CHANGED REGULARLY.

My opinion as the top oils and filters in the order of best:
Oil:
AMSoil
Royal Purple
Mobil 1
Pennzoil
Castrol

Oil Filters:
K&N
Mobil 1 (hardest outer shell filter you'll ever find, good for off road if the filter is positioned where it might get hit by a rock or something)
Wix (Napa Gold same thing) (very well made oil filter, rubber seals, good flow, good oil pressure)
AC Delco
Motorcraft (used to be a Purolator) Good filters but Purolator used to have a band around the filter that could deteriorate.

I personally can't stand Fram oil filters and would not put one on my coffee maker if it took one. Fram used to be nothing but a roll of toilet paper with cardboard seals and pin holes for flow. I've seen them drop oil pressure to nothing and destroy better than regularly maintained engines under 70,000 miles. I was with a group of mechanics that cut one of these filters open after it dropped oil pressure in a drag car to almost nothing. But this was about 25 years ago also. So who knows now. But, to this day, I will not buy one.

Note: just my opinions and a lot of this is from 25 years ago.

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Old 03-10-2016, 10:38 AM   #9
Mike Mac
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Default Re: 1995 yamaha oil type, synthatic or no.

Wow Sprid!! I'd say your back!! That would take me a half a day to compose!!...

Nice work!!
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Old 03-10-2016, 03:05 PM   #10
sjfishon
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Default Re: 1995 yamaha oil type, synthatic or no.

yea, my one finger would be sore;;;;; my neighbor builds engines, 20k engines. he says never use full syn. on a new engine with rings, ges thats all, anyway, after a good break in then run syn. to push a few more secs. but for life of the engine use regular oil. only, i last year got 2, 50cc scooters, they say in the manual, do not use syn; i really think we are finding that syn oil is not as advertised.. steve
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