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Author Topic:   What weight oil for 4-stroke engine
David Jenkins posted 05-17-2003 09:03 PM ET (US)   Profile for David Jenkins   Send Email to David Jenkins  
I bought my 70 hp Evinrude (Suzuki) from iboats and I do not have a manual. Could someone please tell me what weight oil I should be using? Thanks.
JBCornwell posted 05-17-2003 11:01 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
Ahoy, David.

Suzuki calls for 10W40 S_ grade.

I use Mobil 1 but my wrench says I am wasting my bux because I am going to change it at 100 hours either way.

Red sky at night. . .

Dick posted 05-17-2003 11:12 PM ET (US)     Profile for Dick  Send Email to Dick     
Your motor should have come with an owners manual.
Check with IBoats and ask where it is, also check if it was registered so you have a warrany.

Merc uses 25-40 at all temps or 10-30 above 40 degrees


David Jenkins posted 05-18-2003 08:50 AM ET (US)     Profile for David Jenkins  Send Email to David Jenkins     
Above 40 degrees Fahrenheit?

So, what this means is, the hotter it is outside, the more you should use a lower weight oil? I thought that just the opposite was true.

The Suzuki dealer that installed the engine told me to use Castrol 20-50 year round. Maybe he has my manual....

What is "S" grade? Can I get it at Wal-Mart?


JBCornwell posted 05-18-2003 10:54 AM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
To clarify my earlier post:

Quote from the Suzuki DF60-DF70 Owner's Manual, Part # 99011-99E03-03A. Copyright Suzuki Motor Corporation, 2000. Page 4:

"CAUTION. The choice of engine oil is a major factor affecting engine performance and life."

"Using a premium quality four stroke motor oil will increase the service life of your motor. Use only oils that are rated SE, SF, SG, SH or SJ under the API classification system. The viscosity rating should be SAE 10W-40. If an SAE 10W-40 motor oil is not available, select an alternative from the chart below"

The chart suggests substitute viscosity ratings based on temp ranges. 10W-50 is suggested for the same temp range (above -4F) as the 10W-40. For temps above 14F, 20W-50 is an acceptable substitute for the recommended 10W-40..

Red sky at night. . .

Bigshot posted 05-21-2003 02:53 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
I am running Mobil 1 15w-50 synthetic with a fram suzuki samurai filter for $3. I will still change it at 100 hours but I doubt I am wasting my time by using a synthetic. I only run synthetic oil, even in my lawn mower. My father always says "oil is cheaper than metal!". Maybe it is a waste but I sleep better at night and both Mercedes and VW say synthetic only can't suck.
David Jenkins posted 05-21-2003 10:59 PM ET (US)     Profile for David Jenkins  Send Email to David Jenkins     
Can you buy both the oil and the filter at Wal-Mart or is this a NAPA purchase or Suzuki dealership? Do you also change the gear oil at 100 hours? Is that a special oil or just Wal-Mart generic? Thanks.

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