"What places in the 4d55 can develop a leak that's fast enough to run dry on a 20 mile trip?"

The first place I found, which still pisses me off now that I think about it, is at the back of the rocker cover towards the firewall. The rocker cover doesn't sit flush, BY DESIGN, on the block in the back. There's like a half-circle cut and every time that rocker cover comes off, you're gonna need more sealant back there (well, everywhere technically).

For me, when I first picked up my 4D55 that's where I was loosing some oil from old garbage sealant on the rocker arm cover, and the shape of the firewall and block resulted in passenger side oil drips.


Best I got to suggest. Good luck, we're all counting on you.