Mobil1 0W-20
03-29-2020 | 10:45 PM
#1
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Mobil1 0W-20
I mistakenly added 5qts of Mobil1 0W-20 when I changed my oil today. I bought a 5 qt. jug of 15W-50 for my 7.4MPI MerCruiser and the 0W-20 for my GMC truck. I put the lighter stuff in my boat by mistake and then 2 quarts 15W-50 on top of that. Will this harm my engine? It’s a 1998 7.4 MPI with about 300 hrs. I’m in Mississippi-warmer weather if that matters. Thanks in advance.
03-29-2020 | 11:38 PM
#2
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I mistakenly added 5qts of Mobil1 0W-20 when I changed my oil today. I bought a 5 qt. jug of 15W-50 for my 7.4MPI MerCruiser and the 0W-20 for my GMC truck. I put the lighter stuff in my boat by mistake and then 2 quarts 15W-50 on top of that. Will this harm my engine? It’s a 1998 7.4 MPI with about 300 hrs. I’m in Mississippi-warmer weather if that matters. Thanks in advance.
03-30-2020 | 12:25 AM
#3
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Joined: Oct 2000
Posts: 20,233
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From: Omaha/LOTO
That oil is way too thin for a marine engine. Suck it out. 5qt Mobil 1 is only $26 at Walmart. Not worth having a failure.
You have essentially turned it into 5w-30 by adding the 2 qts of 15w-50.
You have essentially turned it into 5w-30 by adding the 2 qts of 15w-50.
03-30-2020 | 09:27 AM
#5
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Joined: Feb 2001
Posts: 4,018
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From: Clearwater, FL
I agree with everyone else. I would get it out of there if it was mine.
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