When I download a new car loan from my bank Quicken's only option is a line of credit & won't link

Divercem

Why won't Quicken let me link my new car loan to the loan I created? It only gives a line of credit option. When I set the loan up Quicken and gave it the starting amount, my bank shows the Principle & Interest different than Quicken calculates. Why can't Quicken take the Principle and Interest that the bank gives me? I will have to constantly add adjustments to get the right $$$ amount to pay off the loan.

UKR

Just my 2cents' worth ... I would not bother attempting to activate any loan or mortgage account for downloading. I would just simply set them up as "offline" (manual) loan accounts.  Of course, car loans are calculated different from mortgages, so you will always have to adjust principal and interest amounts every month to be in line with what the bank actually charged, by a few cents. But at least, adding a manual loan account will give you a usable monthly payment transaction reminder.
(Not discussing LOC or HELOC accounts here. They should be set up like credit card accounts)

At least in Quicken for Windows, an online-connected loan or mortgage account does NOT have a transaction register. All data shown in the account come from whatever information the bank downloads to you ... if this process works at all.

As a result of being connected, the scheduled payment transaction reminder cannot transfer the amount of principal paid into the (non existent) account register and must use a category, usually something like Loan:Principal, instead. The category seems to vary with the Loan Type you selected when creating the loan account in Quicken.

Effective with Quicken Windows 2018+
you can deactivate an online-connected loan account and regain full control over your transaction register.  However, you should still review the Scheduled Reminder (or Memorized Payee List entry) associated with the monthly loan payments to ensure they now transfer Principal to the loan account register and not to a Category.

If you're a Q Mac user, you should be able to do something similar about setting up and maintaining an offline mortgage account together with a correctly calculated Scheduled Transaction Reminder for the monthly payments from your checking account.