Don't seem to sound funny but, just drain the sump and remove the filter. As i believe the oil cooler is mounted towards the front of the engine, the oil is cooled via a sandwich plate between the engine block and filter. So simply a case of drain sump, remove filter/sandwich plate and unbolt oil cooler. Though people with oil cooler's could back me up on this? Personally i would keep it though because if it's going to be more of a trackday warrior/fast road machine, those sustained high revs could make the engine so hot, that it might damage it, due to the oil thinning under extreme temperatures and thereby not able to lubricate the engine. I read somewhere that if you run 230bhp N/A it is advaisable to run an oil cooler, due to the high oil temps that will be reached to run that amount of power. I myself when i can afford it, will be plumbing in an oil cooler on my 1.6 just for peace of mind, so i don't need to worry about the engine at high revs.
you dont need an oil cooler on an xe at all, ever. many a caterham runs without one cos the oil never gets to temp.
anyhoo, just take out the sandwich plate between the block and the filter and put a new filter on, i think its the same screw. bloody should be, the sri is the same block and most didnt have coolers.
I wasn't sure if it was a case of just removing that plate or not (Glad it's that easy). I dont think there wouuld be enough room to route the pipes forward, I seem to remember them sitting very close to the wheel when on lock and wearing them through. Mavv I havn't got an engine yet (doing it in the summer) just getting all my info together before I do it.
Not sure on just removing the sandwich plate and then screwing a filter on, I think (not sure) that you need to get the threaded insert from a non-oil cooler engine, and screw this in first as it will be slightly shorter as it doesn't have to go through the sandwich plate,
On a nova, astra oil cooler pipes can be used without trouble, some people screw a metal plate in the arch to stop the pipes getting chaffed on full lock.
The oil filter thread on a 2.0 seh is a pain as it doesn't fall into vauxhalls imperial pre 85 or metric everything post 85, its somewhere inbetween, I think its shared with a frontera, I've found that for the 2.0seh oil filter are always easier to get from vauxhall whereas motor factors never have this odd threaded filter in stock,
animal has just removed his oil cooler, his oil needs to be at about 100 degrees for optimum protection. With his mocal cooler its barely gets above 70. His cool running stat which opens at just above 70 is doing too good a job. He suspects this is why the engine ate the big end bearings before the super duper standalone oil pump and dry sump was fitted.
I must add thought the vx cooler has a thermostat in the sandwhich plate, so its not gonna be cooling all the time, only at which temp vx decided is critical.