Oil Warning light comes on.....Oh no

[88jettaguy]

I have an 88 Jetta GL 1.8/8v engine RV the oil warning light(buzzer too) comes on then goes out. Oil is full. I have several ideas but that's all. I believe the since it 24yrs old that several things could be wrong....
>clogged pick up screen
>failing oil pump
>faulty oil sending unit
>old age

Should I consider a engine flush first the go from there?

[rdezsofi]

Skip the flush......

Add to your above list:

Intermediate shaft bearings
Oil pump upper shaft bushing
Check wiring to sending unit
Verify oil pressure with a mechanical gauge. (You can temporarily hook one up and drive around to watch it. I'd recommend a permanent installation though.....more reliable.)

[ps2375]

What weight oil?

[88jettaguy]

Oil pressure was in range. Found lower oil pressure sensor failed replaced and all is good

[88jettaguy]

What weight oil?

In the winter 10w/30.
In the summer 20w/50

[gmikel]

In the winter 10w/30.
In the summer 20w/50

way to heavy, find a 5w-40 or 5w-30 you like and use it year round. you want something thats pumping the minute it fires. but then again how many miles do you have? if it's been working keep on.

[Taran]

way to heavy, find a 5w-40 or 5w-30 you like and use it year round. you want something thats pumping the minute it fires. but then again how many miles do you have? if it's been working keep on.

No. In the older 8v engines, 20w-50 is appropriate for summer use, and 10w-30 is fine for winter. Mild winter on the east coast this year, I used 20w-50 all year round in my 1985 GTI (HT engine).