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M1 oil filter question

Old 04-21-2022, 07:58 AM
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Two Mobil 1 filters are referenced as a good filter. Can anyone tell me the difference between the Mobil 1: M1-302 and M1-301 going in a Mercury racing 565
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Old 04-21-2022, 08:15 AM
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different thread size would be the main issue 3/4-16 vs 13/16-16
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Old 04-21-2022, 01:05 PM
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M1-302A is the cross ref for most Merc oil filters

Not 100% sure if its the same for a 565
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Old 04-21-2022, 01:20 PM
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Originally Posted by Griff View Post
M1-302A is the cross ref for most Merc oil filters

Not 100% sure if its the same for a 565
Here is the OE Filter for the 565

Mercury-Mercruiser 35-881126K01 High Performance Oil Filter


so says:

https://www.mercruiserparts.com/bam/...1361/15970/180

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Old 04-21-2022, 02:47 PM
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threads are the difference M1-302 is correct filter, however it does not have a bypass. The M1-303 is same as 302 with a bypass valve, does original filter have a bypass valve? Is it better to have the valve than not.
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Old 04-21-2022, 04:25 PM
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According to the microfiche drawing/parts look up i linked from BAM above, there is a high 30psi bypass (#3 on look up) on the filter head. Therefore, id say a non bypass filter would be better. What does the factory filter have ?
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Old 04-21-2022, 04:46 PM
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Btw: The Napa 1060 (wix51060) are popular on the 525 EFI /700SCI and etc. No relief. Yes on antidrainback. Some like the racing versions: Napa 1060R / Wix 51060R

51060 specs:
https://m.wixfilters.com/Search/PartDetail?PartID=230356%20&Source=WESR

51060R:

https://m.wixfilters.com/Search/Part...20&Source=WESR

Last edited by SB; 04-21-2022 at 04:52 PM.
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Old 04-21-2022, 09:57 PM
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Originally Posted by SB View Post
Here is the OE Filter for the 565

Mercury-Mercruiser 35-881126K01 High Performance Oil Filter


so says:

https://www.mercruiserparts.com/bam/...1361/15970/180
Same filter on 500EFI's , so the M1-302A would be correct.
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