oil ratio

[bjensen64]

Hello everyone, I haven’t been around much but having recently celebrated my daughters wedding I can now pay more attention to other things!

I’m trying to document different details for the motors I have and I’m trying to find out the original oil mixtures for the ones I have listed below:

1930 Johnson K-50 8
1935 Champion Model A 1.5
1936 Johnson K-80 9.3
1938 Champion D2D 4.4
1946 Champion Blue Ribbon 1J 4.2
1947 Martin 60 7.2
1947 Evinrude Sport Twin 4416 2
1953 Johnson TN-25 5
1953 Firestone 7.5
1955 Evinrude Aquasonic? 25
1956 Mercury Mark 25E 20
1957 Johnson JW-13 3
1957 Mercury Mark 30 Turbo 4 30
1983 Evinrude 15

Now, what to run these at may be a separate discussion. I’ve read the oil ratio notes under the FAQ section and it seems I should just run a modern oil at the original mixture and let ’em smoke.

Any and all info is greatly appreciated.

[frankr]

quote bjensen64:

Hello everyone, I haven’t been around much but having recently celebrated my daughters wedding I can now pay more attention to other things!

I’m trying to document different details for the motors I have and I’m trying to find out the original oil mixtures for the ones I have listed below:

1930 Johnson K-50 8
1935 Champion Model A 15—–1/2 pint SAE 30
1936 Johnson K-80 9.3—–1 pint SAE 40
1938 Champion D2D 4.4—–3/4 pint SAE 30
1946 Champion Blue Ribbon 1J 4.2—–3/4 pint SAE 30
1947 Martin 60 7.2—–3/4 pint SAE 40
1947 Evinrude Sport Twin 4416 2
1953 Johnson TN-25 5
1953 Firestone 7.5—–1/2 pint SAE 30
1955 Evinrude Aquasonic? 25
1956 Mercury Mark 25E 20
1957 Johnson JW-13 3
1957 Mercury Mark 30 Turbo 4 30
1983 Evinrude 15

Now, what to run these at may be a separate discussion. I’ve read the oil ratio notes under the FAQ section and it seems I should just run a modern oil at the original mixture and let ’em smoke.

Any and all info is greatly appreciated.

Charts were recently posted for the OMC, which re-started started the usual oil war. And I’ll leave the Mercs to the dark side gurus

[jeff-register]

All the Mercs are 50/1 with Mercury oil.

[bjensen64]

quote :

Re: oil ratio
Quote Jeff Register
Post by Jeff Register » Mon Jul 03, 2017 1:13 pm
All the Mercs are 50/1 with Mercury oil.

Regardless of year?

[bjensen64]

Well, I did what I should have done first – a search within this forum.

Seems to be a highly debated topic without many clear answers.

[jeff-register]

Look on the KG7 & KH7 label My KG7 runs just fine on Merc oil @ 50/1. Run it hard & go to 40/1. Everyone has their own mix opinion. Mk 30 likes it too!
From what I’ve read here, the early motors like sae 30 mixed with outboard oil. Help Garry!

[dave-bernard]

deleted

[dave-bernard]

when mercury came out with the 50:1 oil they recommended it in all there motors they all have needle and ball bearings. that is what is required to use 50:1 oils. I usually use e little richer 40:1 in my old ones just me .in there Race motors double the oil at least. also recommended by mercury.

[bjensen64]

Thanks for the mercury feedback.

[jerry-ahrens]

As for me, I just mix the oil per the motors instructions and ‘let em smoke” as you say. I don’t think many of us run these engine that many hours per year to really worry about it.

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